Task: Program Execution
Input (English): C, 9935, 4579, A, d, 3907, 8649, 3431, 4839, s, 3167, 9903, L, 9517, e, 4629, h, X, 6669, K, Y, 603, A
Output (English): 1, 4, 5, 10, 13, 15, 17, 18, 20, 21, 23