Task: Program Execution
Input (English): k, 8175, 8875, I, 4503, r, 6365, Z, W, M, 6233, Z, 2569, 9091, 865, 8381, O, h, l, 9261, D
Output (English): 1, 4, 6, 8, 9, 10, 12, 17, 18, 19, 21