Task: Program Execution
Input (English): K, 8271, 3909, 5227, Y, 8495, 751, z, 3017, C, X, 1053, 5751, 8169, 931, j, E, 8971, 425, 9539, s
Output (English): 2, 3, 4, 6, 7, 9, 12, 13, 14, 15, 18, 19, 20