Task: Program Execution
Input (English): 1263, X, 6357, 7561, 941, 735, 2253, 2993, 3167, 8889, 9643, 8621
Output (English): X, 1263, 6357, 7561, 941, 735, 2253, 2993, 3167, 8889, 9643, 8621