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we can do it two ways as they provided
def mutate_string(string, position, character):
string = string[:position]+character+string[position+1:]
return string
we can do it two ways as they provided def mutate_string(string, position, character): string = string[:position]+character+string[position+1:] return string
and
def mutate_string(string, position, character): l=list(string); l[position]=character return ''.join(l)
def mutate_string(string, position, character): l = list(string) l[position] = character string = ''.join(l) return string
if name == 'main': s = input() i, c = input().split() s_new = mutate_string(s, int(i), c) print(s_new)