#include<fstream.h>

int cmmdc(int a, int b)
{	if(!b) return a;
	return cmmdc(b,a%b);
}
int main()
{	ifstream fin("euclid2.in");
	ofstream fout("euclid2.out");
	int t,a,b,i;
	fin>>t;
	for(i=1;i<=t;i++)
	{	fin>>a>>b;
		fout<<cmmdc(a,b)<<'\n';
	}
	return 0;
}