Monistus

STR_INPUT = "mis3si1pi"
local_str = STR_INPUT
# 82silisko mis3si1pi

def left_most_digit(str_input, index=0):
    first_digit_index = next((index for index, char in enumerate(str_input) if char.isdigit()), None)
    return first_digit_index
    """
    if str_input.isalpha() == False:
        for i in str_input[index:]:
            if i.isdigit():
                index_new = str_input.index(i)
                return index_new
    else:
        return "alpha"
    """

def update_str(digit_index, local_str):
    if digit_index != "alpha":
        digit = int(local_str[digit_index])
        slice_start = digit_index + 1
        slice_end = digit_index + digit + 1
        substring = local_str[slice_start:slice_end]
        local_str = local_str.replace(str(digit), substring, 1)

        next_index = left_most_digit(local_str, digit_index)
        if next_index is not None:
            return update_str(next_index, local_str)
        else:
            return local_str
    else:
        return local_str


def main():
    print(update_str(left_most_digit(STR_INPUT), local_str))


if __name__ == "__main__":  
    main()

Test 1

Group: 1, 2

Verdict: WRONG ANSWER

Test 2

Group: 1, 2

Verdict: WRONG ANSWER

Test 3

Group: 1, 2

Verdict: WRONG ANSWER

Test 4

Group: 1, 2

Verdict: WRONG ANSWER

Test 5

Group: 1, 2

Verdict: WRONG ANSWER

Test 6

Group: 1, 2

Verdict: WRONG ANSWER

Test 7

Group: 1, 2

Verdict: WRONG ANSWER

Test 8

Group: 2

Verdict: WRONG ANSWER

Test 9

Group: 2

Verdict: WRONG ANSWER

Test 10

Group: 2

Verdict: WRONG ANSWER

Test 11

Group: 2

Verdict: WRONG ANSWER

Test 12

Group: 2

Verdict: WRONG ANSWER

Test 13

Group: 2

Verdict: WRONG ANSWER

Test 14

Group: 2

Verdict: WRONG ANSWER