Task: Program Execution
Input (English): 3439, N, 3259, 1621, l, 941, W, 3375, U, 4259, D, 3337, 2547, B, T, 3265, V, d, u, 6943
Output (English): 2, 5, 7, 9, 11, 14, 15, 17, 18, 19