Task: Program Execution
Input (English): o, 3269, 1231, 4651, k, K, 1399, 4725, 9245, Z, 9537, 9847, P, H, 6343, X, 9753
Output (English): o, k, K, Z, P, H, X, 3269, 1231, 4651, 1399, 4725, 9245, 9537, 9847, 6343, 9753