Task: Program Execution
Input (English): 1223, B, d, 6435, 6147, l, x, g, 2673, 7147, 3223, 837, f, 9443, W, 9367, b, 8551, n, 4259, s, 5313
Output (English): 2, 3, 6, 7, 8, 13, 15, 17, 19, 21