Task: Program Execution
Input (English): 7563, p, 9521, x, 6779, O, L, 7031, 9389, 8975, 7857, 3639, k, f, T, M, O, l, 2107, J, 1413, F, W, H
Output (English): 7563, 9521, 6779, 7031, 9389, 8975, 7857, 3639, 2107, 1413