Task: Program Execution
Input (English): 1543, M, C, 749, 5575, Q, H, 8223, L, 2223, 425, C, k, U, r, 8981, 8851, e, V, v
Output (English): 2, 3, 6, 7, 9, 12, 13, 14, 15, 18, 19, 20