Task: Program Execution
Input (English): z, 9177, 1771, Y, c, k, 1373, 8305, t, 3383, 6793, 1129, 943, 4345, 71, 375, Y, 2499, 2647, 2197
Output (English): 2, 3, 7, 8, 10, 11, 12, 13, 14, 15, 16, 18, 19, 20