Task: Program Execution
Input (English): y, 1457, J, 231, X, 1037, m, 8323, 5237, m, 4797, q, 5373, 5949, r, 6663, 4697, G, 3123, 5591, 339, R
Output (English): 2, 4, 6, 8, 9, 11, 13, 14, 16, 17, 19, 20, 21