Task: Program Execution
Input (English): l, k, 8825, 9289, u, p, 8937, E, 5075, Q, 625, 2889, I, 3381, F, 7, l, M, 767, O, 4541, 9299, 4509
Output (English): 1, 2, 5, 6, 8, 10, 13, 15, 17, 18, 20