from random import *

def generatecode():
    codeLength = 4
    code = ['null','null','null','null']
    for i in range(codeLength) :
        x = randint(1,4)
        if x == 1:
            code[i] = 'R'
        if x == 2:
            code[i] = 'G'
        if x == 3:
            code[i] = 'B'
        if x == 4:
            code[i] = 'Y'
    return code;

def getuserinput():
    while True:
        guess = input('Type your guess: ')
        guess = guess.upper()
        validity = '0'
        #check if guess is valid
        if len(guess) != 4:
            print('Invalid guess length. Please guess only 4 colors.')
        else:
            for i in range(4):
                if (guess[i] != 'R') and (guess[i] != 'G') and (guess[i] != 'B') and (guess[i] != 'Y'):
                    validity = 'invalid'
            if (validity == 'invalid'):
                print('Please only use the characters RGBY')
            else:
                break;
    return guess;

def comparefeedback(code,guess):
    guesscopy = list(guess.upper())
    codecopy = list(code)
    x = 0
    for i in range(4):
        if code[i] == guess[i]:
            del guesscopy[i-x]
            del codecopy[i-x]
            x = x+1
            #look for exact matches, counts them
    if x == 4:
        print('You win! You guessed all colors correctly!')
        return;
    else:
        feedback = 'B' * x
        a = 0
        b = 0
        c = 0
        #look for matches in wrong spot
        while True:
            if c == len(codecopy)*len(guesscopy):
                break;
            if (c % len(guesscopy) == 0) and (c != 0):
                a = a+1
                b = 0
            if codecopy[a] == guesscopy[b]:
                #invalidates the spots with matches so it doesn't see them again
                guesscopy[b] = 'X'
                codecopy[a] = 'z'
                feedback = feedback + 'W'
            b = b+1
            c = c+1
        print(feedback)
        replay()
    return;

def replay():
    guess = getuserinput()
    comparefeedback(code,guess)

code = generatecode()
guess = getuserinput()
comparefeedback(code,guess)