Task: Program Execution
Input (English): 1501, s, 1257, 7499, 9587, v, S, 9761, w, 2729, 4853, 9277, c, 4545, 3357, 5179, z, 3027, 223, y, 6753, K
Output (English): 1, 3, 4, 5, 8, 10, 11, 12, 14, 15, 16, 18, 19, 21