Task: Program Execution
Input (English): f, 3507, 5703, W, 8595, 7641, X, L, 2669, 6789, k, v, 2157, b, w, i, Y, 1451
Output (English): f, W, X, L, k, v, b, w, i, Y, 3507, 5703, 8595, 7641, 2669, 6789, 2157, 1451