Task: Program Execution
Input (English): 4, ['X', 'x', '9133', '9507', '8513', '9831', '2133', '3625', '8891', '9965', '3351', 'T', '5521', 'p', 'o', 'W', '309']
Output (English): X, 8513, 8891, 5521, 309