Challenge #17 - Mutations

 def mutate_string(string, position, character):

    s = list(string)
    s[position] = character
    return ''.join(s)

if __name__ == '__main__':
    s = input()
    i, c = input().split()
    s_new = mutate_string(s, int(i), c)
    print(s_new)

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