Task: Program Execution
Input (English): 3125, 5067, 7009, 4809, 2661, I, 1525, O, 6261, 6041, 4155, e, f, U, N, 8591, X, 3251, 3977, O, 3397
Output (English): 1, 2, 3, 4, 5, 7, 9, 10, 11, 16, 18, 19, 21