input: Write a python function to remove non-numeric characters from a string.
  assert remove_non_numeric("29A3B8746") == 2938746
  assert remove_non_numeric("abc123xyz") == 123
  assert remove_non_numeric("100 bananas!") == 100
output: def remove_non_numeric(s):
      return int(''.join(filter(str.isdigit, s)))