Task: Program Execution
Input (English): W, 9355, 8537, 8775, 3981, c, T, s, N, t, 3213, 4685, 453, f, I, 2547, X, w, 7401, 693, s, 5001, 7173
Output (English): 1, 6, 7, 8, 9, 10, 14, 15, 17, 18, 21