import numpy as np
"""
# 1)

    Define a function MaxOfThree() that takes three numbers as arguments
    and returns the largest of them (Use If, elif and else).
    For example, MaxOfThree(1,  2,  3) should return 3

def MaxOfThree(x1, x2, x3):
    if (type(x1) == int and type(x2) == int and type(x3) == int):
        if(x1 > x2 and x1> x3):
            return x1
        elif(x2 > x1 and x2> x3):
            return x2
        else:
            return x3
    else:
        print("Dambass, input numbers only!")

print(MaxOfThree(1,"2",3))


# 2)

    Define a function MySum() and a function MyMultiply() that sums
    and multiplies (respectively) all the numbers in a list of
    numbers (Use for). For example, s MySum([1, 2, 3, 4]) should return 10,
    and MyMultiply([1, 2, 3, 4]) should return 24.

n = range(1, 6)
def MySum(list1):
    sum =0
    for l in list1:
        sum += l
    return sum

def MyMultiply(list2):
    mult = 1
    for l in list2:
        mult *= l
    return mult

print(MySum(n))
print(MyMultiply(n))


# 3)

    Define a function MyMean() that receives an unknown amount
    of input values from a user and returns the mean value of all the
    input values (Use while). For example: if the user provides [1, 2, 3, 4],
    the MyMean(), should return 2.5

def MyMean(l):
    print(np.mean(l))

final = []
while True:
    means = input('Please enter a number: ')
    if not means:
        break
    final.append(int(means))

MyMean(final)

    Define a function MyStars() that takes a list of integers and prints
    a string of stars which has the length of a value of an integer to
    the screen. For example, MyStars([3, 9, 7]) should print the following:
    ***
    *********
    *******


numbers = []

while True:
    means = input('Please enter a number: ')
    if not means:
        break
    numbers.append(int(means))


def MyStars(l):
    for i in l:
        print("*"*i)

MyStars(numbers)

# 5)
    Define a function SecondBest() that receives a list of numbers and
    returns the second largest and second smallest numbers. For example,
    SecondBest([1, 2, 3, 4]) should return [3, 2] (do not use built in
    functions such as max or sort).
    best_list = []

while True:
    means = input('Please enter a number: ')
    if not means:
        break
    best_list.append(int(means))

def SecondBest(best_list):
    if best_list[0] > best_list[1]:
        first_max = best_list[0]
        first_min = best_list[1]
    else:
        first_max = best_list[1]
        first_min = best_list[0]
    second_min = first_max
    second_max = first_min

    for i in range(2, len(best_list)):
        if best_list[i] > first_max:
            second_max = first_max
            first_max = best_list[i]
        elif best_list[i] < first_min:
            second_min = first_min
            first_min = best_list[i]
    return second_min, second_max

x, y = SecondBest(best_list)
print("Second largest number is " + str(y))
print("Second smallest number is " + str(x))

"""

#6)
letters = []
while True:
    input_l = input('Please enter a letter: ')
    if not input_l:
        break
    letters.append(input_l)

def MySort(char_list):
    sorted_l = [range(ord("a"), ord("z"))]
    for i in char_list:
        sorted_l[chr(ord(i))] += 1
    for j in sorted_l:
        while j>0:
            char_list.append(chr(ord("a")+j))
            j -= 1
    return char_list

print(MySort(letters))