Task: Program Execution
Input (English): 6939, 3577, L, v, x, 531, 8613, 8205, u, 9549, i, 2239, n, s, r, l, F, W, S, z, K, 6369, N
Output (English): 3, 4, 5, 9, 11, 13, 14, 15, 16, 17, 18, 19, 20, 21, 23