code: def keep_only_digits(txt):
      return "".join(filter(str.isdigit, txt))
  
imports: import os
  import sys
  import time
  import heapq
  import semver
  import random
  from multiprocessing import Pool
  from collections import namedtuple
label_desc: Use image node_id 2 for calling a global function with example usage: keep_only_digits(txt) and returns: str