Task: Program Execution
Input (English): 7349, u, 9833, M, K, 9655, 8373, x, 6445, A, 2437, E, 2787, 5449, 5641, 1707, o, 6587, x, w, t
Output (English): 2, 4, 5, 8, 10, 12, 17, 19, 20, 21