ORAC — Frog

Time Limit	Memory Limit	Input File	Output File
1 second	256 MiB	`frogin.txt`	`frogout.txt`

- Subtask 1 (30 points) has 18 cases.
- Subtask 2 (30 points) has 27 cases.
- Subtask 3 (40 points) has 37 cases.