Task: Program Execution
Input (English): 8761 d a q 4401 4461 5007 h 6259 1751 7633 8689 m 3403 x 3339 j q t u 1795 2903 6593 5995 i q 9579 n c d u 6159
Output (English): a, c, d, h, i, j, m, n, q, t, u, x