Task: Program Execution
Input (English): 4445, 6917, 6221, 6351, y, O, J, 4457, n, 2957, 7453, O, O, t, 8327, q, t, t, 3373, 3849, 3869, E, P
Output (English): 1, 2, 3, 4, 8, 10, 11, 15, 19, 20, 21