Task: Program Execution
Input (English): a v 7135 7717 c 3107 j 9057 x w 8357 1317 53 t 8129 4505 g m x n 6669 f a 9999 8651 691 1441 3449 5643 k 7139 u 8223 7709 x 6841 9931 7883 g 2249 8505 z 1863
Output (English): a, c, f, g, j, k, m, n, t, u, v, w, x, z