Task: Program Execution
Input (English): 4083, 9595, 8287, M, 6745, 3971, U, y, r, F, 4709, 5275, 3785, A, 7929, O, 6621, c, 3845, 9225, 887
Output (English): 1, 2, 3, 5, 6, 11, 12, 13, 15, 17, 19, 20, 21