Task: Program Execution
Input (English): 2, 4, ['333', 'S', 'c', 'P', '1991', '5109', 'K', 'm', 'm', '8395', 'R', '2265', 'l', '8135', 'G', '7835', 'u', 'x', '5451', '8249']
Output (English): S, 5109, 8395, 8135, x