Task: Program Execution
Input (English): U, 2417, 187, 4761, y, 6437, O, b, C, 5703, j, 3319, q, 5389, 8487, 9917, 3201, I, X, 8601, T, j, 6883, b
Output (English): 2, 3, 4, 6, 10, 12, 14, 15, 16, 17, 20, 23