Task: Program Execution
Input (English): 2181, 3465, B, 8447, 3039, 9961, 5721, k, B, v, 5087, W, l, 727, 259, G, 7777, 3561, B, 6757
Output (English): 1, 2, 4, 5, 6, 7, 11, 14, 15, 17, 18, 20