import random
print("List of possible functions:\nPrintTo()\nLineChars()\nBackwardsStr()\nCase()\nQuestion()\nEmailCheck()\nStrLen()\nBackwardsSentence()\nCapitalise()\nRandNumMatrix()\nPatternPrint()\nVowels()\nTeacherCodes()\n")

StrNum = 0
StrNum2 = 0
FinalChoice = ("")
Running = True
Alphabet = ["A","B","C","D","E","F","G","H","I","J","K","L","M","N","O","P","Q","R","S","T","U","V","W","X","Y","Z","!","£","$","%","&","*","(",")","€","¬",":",";","@","#","[","]","{","}"]

def Reset():
    StrNum = 0
    StrNum2 = 0
    FinalChoice = ("")
    Running = True
    Alphabet = ["A","B","C","D","E","F","G","H","I","J","K","L","M","N","O","P","Q","R","S","T","U","V","W","X","Y","Z","!","£","$","%","&","*","(",")","€","¬",":",";","@","#","[","]","{","}"]

def PrintTo():
    global StrNum,StrNum2
    Reset()
    FirstChoice = input("Enter Words here\n")
    StrNum = int(input("Enter number of letters to print\n"))
    StrNum2 = int(input("Enter number of letter to start at(0 begins at beginning)\n"))
    for i in range (StrNum2,(StrNum2+StrNum)):
        FinalChoice = FinalChoice + FirstChoice[i]
    return FinalChoice


def LineChars():
    global StrNum
    Reset()
    FirstChoice = input("Enter Words here\n")
    for i in FirstChoice:
        print(FirstChoice[StrNum])
        StrNum = StrNum + 1


def BackwardsStr():
    Reset()
    FirstChoice = input("Enter Words here\n")
    StrNum = (int(len(FirstChoice)))
    for i in range(0,StrNum):
        StrNum2 = StrNum - i - 1
        FinalString = FinalString + FirstChoice[StrNum2]
    return print(FinalString)


def Case():
    Reset()
    FirstChoice = input("Enter Words here\n")
    SecondChoice = input("Do you want upper case or lower case? Type 'Upper' or 'Lower'\n")
    if SecondChoice == ("Upper"):
        FirstChoice = FirstChoice.upper()
    elif SecondChoice == ("Lower"):
        FirstChoice = FirstChoice.lower()
    else:
        print("Can't do that! Check your spelling")
        Case()
    print(FirstChoice)


def Question():
    Reset()
    FirstChoice = input("What is your name?\n")
    print("Hello, " + FirstChoice + ", and bye!")


def EmailCheck():
    Reset()
    global IsEmail
    global FirstChoice
    IsEmail = False
    FirstChoice = input("Enter your email!\n")
    for i in range(0,(len(FirstChoice))):
        StrNum = (int(i))
        if FirstChoice[i] == "@":
            IsEmail = True
    return A()


def A():

    if IsEmail == False:
        print("This is not a Valid Email.")
        EmailCheck()
    else:
        print("Thanks! Your Email has been verified (" + FirstChoice + ")")


def StrLen():
    Reset()
    FirstChoice = input("Enter Words here\n")
    StrNum = len(FirstChoice)
    print(StrNum)


def BackwardsSentence():
    Reset()
    FirstChoice = input("Enter sentence here\n")
    StrNum = (int(len(FirstChoice)))
    for i in range(0,StrNum):
        StrNum2= StrNum - i - 1

        FinalString = FinalString + FirstChoice[StrNum2]
    return print(FinalString)


def Capitalise():
    Reset()
    FirstChoice = input("Enter sentence here\n")
    StrNum = (int(len(FirstChoice)))
    FinalChoice = FirstChoice[0].upper()
    for i in range (1,StrNum):
        FinalChoice = FinalChoice + FirstChoice[i].lower()
    return FinalChoice
    print(FinalChoice)

def RandNumMatrix():
    Reset()
    while Running:
       for i in range(0,234):
        StrNum2 = random.randint(0,((len(Alphabet)) - 19))
        StrNum2 = Alphabet[StrNum2]
        StrNum3 = random.randint(0,234)
        StrNum4 = random.randint(0,((len(Alphabet)) - 19))
        StrNum4 = Alphabet[StrNum4]
        StrNum5 = random.randint(0,((len(Alphabet)) - 19))
        StrNum5 = Alphabet[StrNum5]
        StrNum6 = random.randint(0,((len(Alphabet)) - 19))
        StrNum6 = Alphabet[StrNum6]
        StrNum7 = random.randint(0,((len(Alphabet)) - 19))
        StrNum7 = Alphabet[StrNum7]
        StrNum8 = random.randint(0,((len(Alphabet)) - 19))
        StrNum8 = Alphabet[StrNum8]

        StrNum9 = random.randint(0,((len(Alphabet)) - 19))
        StrNum9 = Alphabet[StrNum9]
        StrNum10 = random.randint(0,((len(Alphabet)) - 19))
        StrNum10= Alphabet[StrNum10]
        StrNum11 = random.randint(0,((len(Alphabet)) - 19))
        StrNum11 = Alphabet[StrNum11]
        StrNum12 = random.randint(0,((len(Alphabet)) - 19))
        StrNum12 = Alphabet[StrNum12]
        StrNum13 = random.randint(0,((len(Alphabet)) - 19))
        StrNum13 = Alphabet[StrNum13]
        StrNum14 = random.randint(0,((len(Alphabet)) - 19))
        StrNum14 = Alphabet[StrNum14]
        StrNum15 = random.randint(0,((len(Alphabet)) - 19))
        StrNum15 = Alphabet[StrNum15]
        FinalChoice = (" ")*StrNum3 + StrNum4 +  StrNum5  + StrNum6 +  StrNum7 + StrNum8 + StrNum9 + StrNum10+ StrNum11+ StrNum12+ StrNum13+ StrNum14+ StrNum15
        print(FinalChoice)

def PatternPrint():
    Reset()
    while Running:
        for i in range(0,400):
            StrNum = i
            StrNum2 = random.randint(0,((len(Alphabet)) - 1))
            StrNum3 = StrNum2
            StrNum2 = Alphabet[StrNum2]
            print((StrNum2)*StrNum3)

def TeacherCodes():
    #This calls the reset function, which clears all the variables so that it doesnt have errors when ran again.
    Reset()
    #This asks for an input, and sets it to the variable FirstChoice
    FirstChoice = input("Enter Name here\n")
    #this sets variable StrNum to the length of the input above
    StrNum = (int(len(FirstChoice)))
    #this sets the variable FinalChoice to a blank string.
    FinalChoice = ("")
    #this is a for-loop that runs for the length of StrNum, which is the length of the FirstChoice, the input.
    #I do this so it can check the entire sentences letters in order.
    for i in range (StrNum):
        #this checks if there is a space in the word which lets it know it is a Surname and Forename.
        if FirstChoice[i] == " ":
            #this code puts the first letter of the first word, first letter of the second word,
            #and last letter of the second word in a seperate string
            FinalChoice = FinalChoice + FirstChoice[0]
            FinalChoice = FinalChoice + FirstChoice[i+1]
            FinalChoice = FinalChoice + FirstChoice[StrNum-1]
            #this makes the word capital
            FinalChoice = FinalChoice.upper()

    #this returns the final Teachercode.
    return FinalChoice

def Vowels():
    #This calls the reset function, which clears all the variables so that it doesnt have errors when ran again.
    Reset()
    #This asks for an input, and sets it to the variable FirstChoice
    FirstChoice = input("Enter sentence here\n")
    #this sets variable StrNum to the length of the input above
    StrNum = (int(len(FirstChoice)))
    #this sets the variable FinalChoice to a blank string.
    FinalChoice = ("")
    #this is a for-loop that runs for the length of StrNum, which is the length of the FirstChoice, the input.
    #I do this so it can check the entire sentences letters in order.
    for i in range (StrNum):
        if FirstChoice[i] == "A" or FirstChoice[i] == "E" or FirstChoice[i] == "I" or FirstChoice[i] == "O" or FirstChoice[i] == "U" or FirstChoice[i] == "a" or FirstChoice[i] == "e" or FirstChoice[i] == "i"or FirstChoice[i] == "o" or FirstChoice[i] == "u":
            FinalChoice = FinalChoice + FirstChoice[i]

    return FinalChoice