Task: Program Execution
Input (English): 1, 7, ['6453', '1279', '3345', 'V', '6037', 'g', '9383', '6737', '7431', 'R', '1005', 'M', 'x', 'G', '1519', '163', '1807', 'f', '6521', 'F']
Output (English): 6453, 6737, 1519