Task: Program Execution
Input (English): I, 8957, 1437, 3993, 2629, O, r, 1135, 9037, 3979, 8917, 2271, R
Output (English): I, O, r, R, 8957, 1437, 3993, 2629, 1135, 9037, 3979, 8917, 2271