Task: Program Execution
Input (English): f, 7451, 1725, 8559, 707, z, 3735, e, j, S, 4373, t, R, F, H, 9435, 655, o, j, 1415
Output (English): 1, 6, 8, 9, 10, 12, 13, 14, 15, 18, 19