Task: Program Execution
Input (English): 5431, f, Q, 2173, 2603, 2369, 7199, 4423, o, g, 3191, f, 8263, 5409, c, G, h, 4479, 6867, 31
Output (English): 1, 4, 5, 6, 7, 8, 11, 13, 14, 18, 19, 20