Task: Program Execution
Input (English): d, 1079, e, 9319, 2843, 7735, x, 1935, z, 7969, j, 5499, p, u, x, m, f, w, 1353, 4629, l, v
Output (English): d, e, f, j, l, m, p, u, v, w, x, z