string_mutations.py

# Task
# Read a given string, change the character at a given index and then print the modified string.
# Function Description
# Complete the mutate_string function in the editor below.
# mutate_string has the following parameters:
# string string: the string to change
# int position: the index to insert the character at
# string character: the character to insert
# Returns
# string: the altered string

def mutate_string(string, position, character):
    l = list(string)
    l[position] = character
    return ''.join(l)

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



#-------------------------OR------------------------

def mutate_string(string, position, character):
    new_string = string[:position] + character + string[position + 1:]
    return new_string

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