Task: Program Execution
Input (English): B, 2939, 9749, A, z, 5515, 5739, 3061, b, 8057, q, 8709, W, A, 2877, 167, 2015, 9737, 7311, F, L, 9509, 1789, 5307
Output (English): 1, 4, 5, 9, 11, 13, 14, 20, 21