Task: Program Execution
Input (English): b, 7637, 3741, 6515, j, 1849, H, i, 901, L, F, Y, F, 921, I, 3337, s, a, D
Output (English): 1, 5, 7, 8, 10, 11, 12, 13, 15, 17, 18, 19