Task: Program Execution
Input (English): 621, I, U, 8033, 1439, 5281, 7277, 9523, 8437, 6613, u, I, 5867, 1349, 7961, k, N
Output (English): 1, 4, 5, 6, 7, 8, 9, 10, 13, 14, 15