Task: Program Execution
Input (English): c, d, r, t, 1693, d, 3291, 4789, t, e, z, 9977, l, f, 765, j, k, 4521, 7903, 9587, 2227, 1807, q, 8637
Output (English): c, d, e, f, j, k, l, q, r, t, z