Monistus

def get_new_string(string, index):
    
    string = list(string)
    i = index
    while i < len(string):
        if(string[i].isnumeric()):
            string = string[0:i] + string[i+1:i+int(string[i])+1]*2 + string[i+int(string[i])+1:]
            break
        i += 1
    
    return string, i

syöte = input()
ind = 0

while True:
    if(any(char.isdigit() for char in syöte)):
        syöte, ind = get_new_string(syöte, ind)
        
    else:
        break

print("".join(syöte))

Test 1

Group: 1, 2

Verdict: ACCEPTED

Test 2

Group: 1, 2

Verdict: ACCEPTED

Test 3

Group: 1, 2

Verdict: ACCEPTED

Test 4

Group: 1, 2

Verdict: ACCEPTED

Test 5

Group: 1, 2

Verdict: ACCEPTED

Test 6

Group: 1, 2

Verdict: ACCEPTED

Test 7

Group: 1, 2

Verdict: ACCEPTED

Test 8

Group: 2

Verdict: TIME LIMIT EXCEEDED

Test 9

Group: 2

Verdict: TIME LIMIT EXCEEDED

Test 10

Group: 2

Verdict: TIME LIMIT EXCEEDED

Test 11

Group: 2

Verdict: TIME LIMIT EXCEEDED

Test 12

Group: 2

Verdict: TIME LIMIT EXCEEDED

Test 13

Group: 2

Verdict: TIME LIMIT EXCEEDED

Test 14

Group: 2

Verdict: TIME LIMIT EXCEEDED