Monistus

import re
from sys import stdin, stdout

try:
    bytes_stdin, bytes_stdout = stdin.buffer, stdout.buffer
except AttributeError:
    bytes_stdin, bytes_stdout = stdin, stdout
i = stdin.readline()
tempstr = "."
while tempstr != "":
    z = 0
    tempstr = ""
    match = re.search('\d', i)
    if match:
        z= int(match.group())
        f= match.start()
        i = i[:f] + i[f + 1:]
        for item in range(int(z)):
            tempstr += i[item+f]
            z -= 1
        i = i[:(f)] + tempstr + i[f:]
        
print(i)

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