input: from typing import List
  
  
  def find_numeric_strings(strings: List[str]) -> List[str]:
      """Given a list of strings, return a list of the strings that are numeric.
      A string is considered numeric if it contains only digits.
      
      >>> find_numeric_strings(['123', 'abc', '456', '789abc'])
      ['123', '456']
      >>> find_numeric_strings(['', '   ', '12345'])
      ['12345']
      """
output:     return [s for s in strings if s.isdigit()]