Task: Program Execution
Input (English): 3449, 9063, 8645, o, 3267, c, 537, 3451, 4347, 1553, Y, 1735, i, I, 7789, R, 831, 1485, F
Output (English): 1, 2, 3, 5, 7, 8, 9, 10, 12, 15, 17, 18