#include <fstream>
using namespace std;

ifstream fin("euclid2.in");
ofstream fout("euclid2.out");

int t,a,b,r;

int main(){
    fin>>t;
    for(int i=1; i<=t; ++i){
        fin>>a>>b;
        if(a<b){
            int aux=a;
            a=b;
            b=aux;
        }
        while(b){
            r=a%b;
            a=b;
            b=r;
        }
        fout<<a<<'\n';
    }
    return 0;
}