Number of Closed Islands

Implement solve for Number of Closed Islands. Return the required output for the provided arguments.

Examples
Input: [[1,1,1,1,1,1,1,0],[1,0,0,0,0,1,1,0],[1,0,1,0,1,1,1,0],[1,0,0,0,0,1,0,1],[1,1,1,1,1,1,1,0]]
Output: 2
Hints

Number of Closed Islands

Implement `solve` for **Number of Closed Islands**. Return the required output for the provided arguments.