Task: Program Execution
Input (English): l, 707, 6987, 3815, 3777, 6963, x, u, z, y, c, p, f, t, n, 2787, o, c, 5033, f, 2743, 5029, r, 8901
Output (English): c, f, l, n, o, p, r, t, u, x, y, z