input: from typing import List
  
  def extract_words_starting_with(text: str, starting_letter: str) -> List[str]:
      """ Extract all the words starting with a specific letter
      >>> extract_words_starting_with('This is a sample sentence to test the program', 's')
      ['sample', 'sentence', 'test', 'the', 'program']
      """
      words_list = []
      for word in text.split():
          if word.startswith(starting_letter):
              words_list.append(word)
      return words_list
output:     words_list = []
      for word in text.split():
          if word.startswith(starting_letter):
              words_list.append(word)
      return words_list