Task: Program Execution
Input (English): c, 5121, l, 6749, Y, 6177, d, u, 5953, q, 1009, 1075, y, 871, 7813, 8231, 3469, 5729
Output (English): 2, 4, 6, 9, 11, 12, 14, 15, 16, 17, 18