Task: Program Execution
Input (English): 2, 13, ['U', 'X', 'G', '2521', 'D', '8433', '3007', 'f', 'p', '3857', '5917', '3721', 'Q']
Output (English): X, G, 2521, D, 8433, 3007, f, p, 3857, 5917, 3721, Q