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