Task: Program Execution
Input (English): W, X, 7557, o, k, T, 4623, Q, 4119, 1515, d, 5591, 6221, X, U, 9435, 3851, u, N
Output (English): 7557, 4623, 4119, 1515, 5591, 6221, 9435, 3851