Given a map of a dungeon, your task is to take all TWO diamonds in the dungeon. Find the minimum number of gates you have to open to take all the diamonds. Note: It can be more than one gate to go into the dungeon from the outside. You can move up, down, left, right or diagonal About the map: — The letter '.' means blank space, you can move on it — The letter '*' means blockade, you have to go around it — The letter '#' means there's a gate at that place, you need it opened to go through it — The letter '$' means the diamond. Input format: — First line is two number N and M — the dungeon has the size N*M. — N lines following, represent the map of the dungeon. Output format: — A single integer — the minimum number of gates you have to open. Example input: 5 9

****#****

..#.#..

****.****

$$$#.#.#$$$

********* Example output: 4 Thank you guys, hope you have a great standing in the next contest.