Task: Program Execution
Input (English): B, 8461, 7833, s, h, 1439, X, Z, 5179, u, 9115, 5485, 8885, n, 9691, H, z, 4623, 8997, 4053, A, 1743, P
Output (English): 1, 4, 5, 7, 8, 10, 14, 16, 17, 21, 23