Task: Program Execution
Input (English): 1, 3, ['5977', 'f', '3139', 't', '6961', 'c', 'a', 'm', 'X', '9911', 'a', 'Q', '2225', '721', '8133', '8645', 'W']
Output (English): 5977, t, a, 9911, 2225, 8645