#include <fstream>
using namespace std;

ifstream ifs("euclid2.in");
ofstream ofs("euclid2.out");

/*inline int cmmdc(int a,int b){
	if(b==0)
		return a;
	else
		return cmmdc(b,a%b);
} */

inline long cmmdc(long a, long b){
	int t;
	if(b>a){
		t=b;
		b=a;
		a=t;
	}
	while(t=a%b){
		a=b;
		b=t;
	}
	return b;
}


int main(){
	long T,a,b;
	ifs>>T;
	while(T--){
		ifs>>a>>b;
		ofs<<cmmdc(a,b)<<endl;
	}
	return 0;
}