#include <iostream>
#include <fstream>
using namespace std;


int n,i,a,b;
 int cmmdc( int a,  int b)
{
	while(a!=b)
	{
		if(a>b)
			a=a-b;
		else
			b=b-a;
	}
	return a;
}
int main()
{
    ifstream f("euclid2.in");
    ofstream g("euclid2.out");
    f>>n;
    for(i=1;i<=n;i++)
    {
        f>>a>>b;
        g<<cmmdc(a,b)<<'\n';
    }
    return 0;
}