HackerRank: Separate the Numbers

separate.py

#!/bin/python3

import sys

DEBUG = False

q = int(input().strip())
for a0 in range(q):
    s = input().strip()
    if DEBUG: print(s)
        
    if len(s) == 1:
        print('NO')
        continue
        
    original_n = 1
    n = 1
    pointer = 0
    first_sequence = s[pointer:pointer+n]
    while pointer+n < len(s) and n > 0:
        num = s[pointer:pointer+n]
        if DEBUG: print(num)
        nextn = pointer + n
        if num[-1] == '9':
            n = len(str(int(num)+1))
        nextnum = s[nextn:nextn + n]
        if DEBUG: print(nextnum)
        if int(num) == int(nextnum)-1 and num[0] != '0' and nextnum[0] != '0':
            pointer = nextn
            if (pointer+n) >= len(s):
                print('YES', first_sequence)
                if DEBUG: print()
                break
            if DEBUG: print('-')
        else:
            if DEBUG: print('+')
            original_n += 1
            n = original_n
            pointer = 0
            first_sequence = s[pointer:pointer+n]
        if pointer+n >= len(s):
            print('NO')
            if DEBUG: print('')