Given a graph with N nodes and M directed edges. Your task is to complete the function kosaraju() which returns an integer denoting the number of strongly connected components in the graph.

Input:
The first line of input contains an integer T. Then T test cases follow. Each test case contains two integers N and M . In the next line there are M space separated values u,v denoting an edge from u to v.

Output:
For each test case in a new line output will an integer denoting the no of strongly connected components present in the graph.

User Task:
Since this is a functional problem you don't have to worry about input, you just have to complete the function kosaraju().

Constraints:
1 <= T <= 100
1 <= N,M <= 100
0 <= u,v <= N-1

Example:
Input:
2
5 5
1 0 0 2 2 1 0 3 3 4
3 3
0 1 1 2 2 0

Output:
3
1

Explanation:
Testcase 1:
There is a connected subgraph that includes 0-1-2 which satisfy the condition of strongly connecting components i.e each node is reachable from every other nodes.

Another subgraph includes individual nodes 4 and 3 . That gives us count of total 3 subgraphs satisfying the condition of strongly connected components. 
 

** For More Input/Output Examples Use 'Expected Output' option **