Task: Program Execution
Input (English): 2881, k, 5431, x, U, 5929, 3377, o, O, L, 8043, o, i, N, 9639, 7853, 2805, 8591, 4663, g, x, w
Output (English): 2, 4, 5, 8, 9, 10, 12, 13, 14, 20, 21, 22