Task: Program Execution
Input (English): a v 7877 8689 3581 g 8669 555 8575 8513 s l Z 9061 u L 2805 F 6353 X 6979 9881 7765 1743 3371 O 2065 G a 4297 4373
Output (English): 3, 4, 5, 7, 8, 9, 10, 14, 17, 19, 21, 22, 23, 24, 25, 27, 30, 31