Monistus

# Toimiiks tää pythonilla

s = list(input()[::-1])
rs = []
n = len(s)

while len(s) > 0:
  if s[-1] in ["1", "2", "3", "4", "5", "6", "7", "8", "9"]:
    num = int(s[-1])
    s = s[:-1]
    monistus = []
    for i in range(num):
      monistus += s[-num + i]
    s += monistus
    continue
  rs += s[-1]
  s = s[:-1]

for i in rs:
  print(i, end="")

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