Task: Program Execution
Input (English): 7643, 9677, F, w, S, f, l, 6401, 5731, 7421, 1521, k, h, 6851, 1373, 8807, i, y, 9053, f
Output (English): 7643, 9677, 6401, 5731, 7421, 1521, 6851, 1373, 8807, 9053