Task: Program Execution
Input (English): t, y, a, 8717, L, 6391, 4171, 9893, 9859, 5617, M, 6589, I, X, W, 8231, 5161, K, k, 1773, 979, i, M
Output (English): 4, 6, 7, 8, 9, 10, 12, 16, 17, 20, 21