Task: Program Execution
Input (English): O, X, Q, 9121, X, k, 2389, 7129, U, H, Y, 6947, 5799, 6031, 757, 5215, D, k, 4101, 4515, 5513, 783, f, E
Output (English): O, X, Q, X, k, U, H, Y, D, k, f, E, 9121, 2389, 7129, 6947, 5799, 6031, 757, 5215, 4101, 4515, 5513, 783