Monistus

string = input("")
stack = []
for i in range(len(string) - 1, -1, -1):
    if string[i].isalpha():
        continue
    number = int(string[i])
    stack.append((i + 1, i + number))          #-(len(string) - (i + number))))
new_string = string
result_string = string
last_result_string = string
add_to_end_index = []

while len(stack) != 0:
    start_index, end_index = stack.pop(0)
    add_to_end = 0
    for i in range(len(add_to_end_index)):
        index, amount = add_to_end_index[i]
        if start_index + 9 < index :
            add_to_end_index.pop(i)
            continue
        if start_index < index and index < end_index:
            add_to_end += amount
    add_to_end_index.append((start_index, end_index - start_index))
    result_string = last_result_string[0:start_index-1]
    result_string += last_result_string[start_index:end_index+add_to_end+1]
    result_string += last_result_string[start_index+add_to_end:]
    last_result_string = result_string
print(last_result_string)

Test 1

Group: 1, 2

Verdict: RUNTIME ERROR

Traceback (most recent call last):
  File "/box/input/code.py", line 17, in <module>
    i...

Test 2

Group: 1, 2

Verdict: RUNTIME ERROR

Traceback (most recent call last):
  File "/box/input/code.py", line 17, in <module>
    i...

Test 3

Group: 1, 2

Verdict: RUNTIME ERROR

Traceback (most recent call last):
  File "/box/input/code.py", line 17, in <module>
    i...

Test 4

Group: 1, 2

Verdict: RUNTIME ERROR

Traceback (most recent call last):
  File "/box/input/code.py", line 17, in <module>
    i...

Test 5

Group: 1, 2

Verdict: RUNTIME ERROR

Traceback (most recent call last):
  File "/box/input/code.py", line 17, in <module>
    i...

Test 6

Group: 1, 2

Verdict: RUNTIME ERROR

Traceback (most recent call last):
  File "/box/input/code.py", line 17, in <module>
    i...

Test 7

Group: 1, 2

Verdict: RUNTIME ERROR

Traceback (most recent call last):
  File "/box/input/code.py", line 17, in <module>
    i...

Test 8

Group: 2

Verdict: RUNTIME ERROR

Traceback (most recent call last):
  File "/box/input/code.py", line 17, in <module>
    i...

Test 9

Group: 2

Verdict: RUNTIME ERROR

Traceback (most recent call last):
  File "/box/input/code.py", line 17, in <module>
    i...

Test 10

Group: 2

Verdict: RUNTIME ERROR

Traceback (most recent call last):
  File "/box/input/code.py", line 17, in <module>
    i...

Test 11

Group: 2

Verdict: RUNTIME ERROR

Traceback (most recent call last):
  File "/box/input/code.py", line 17, in <module>
    i...

Test 12

Group: 2

Verdict: RUNTIME ERROR

Traceback (most recent call last):
  File "/box/input/code.py", line 17, in <module>
    i...

Test 13

Group: 2

Verdict: RUNTIME ERROR

Traceback (most recent call last):
  File "/box/input/code.py", line 17, in <module>
    i...

Test 14

Group: 2

Verdict: RUNTIME ERROR

Traceback (most recent call last):
  File "/box/input/code.py", line 17, in <module>
    i...