#include <fstream>
using namespace std;
ifstream in('euclid2.in');
ofstream out('euclid2.out');
int t,a,b;
int euclid(int a,int b){
    int r;
    while(b!=0){
        r=a%b;
        a=b;
        b=r;
    }
    return a;
}
int main(){
    in>>t;
    for(int i=1;i<=t;i++){
            in>>a>>b;
            out<<euclid(a,b)<<"\n";
    }
    return 0 ;
}