Task: Program Execution
Input (English): b, f, 137, e, 6943, W, y, E, 929, Z, 2913, I, 1013, 2993, 5345, P, j, 7067, 5111, B, 3635, 6629
Output (English): b, f, e, W, y, E, Z, I, P, j, B