Task: Program Execution
Input (English): 6509, 7311, 8995, G, m, 6411, 3989, 447, L, y, 5547, V, 5369, 3419, 1917, 4855, 8785, s, 8519, 3725, G
Output (English): 1, 2, 3, 6, 7, 8, 11, 13, 14, 15, 16, 17, 19, 20