#include <fstream>
using namespace std;
ifstream fin("euclid2.in");
ofstream fout("euclid2.out");
int cmmdc(int a,int b){
    int r;
    while(b){
        r=a%b;
        a=b;
        b=r;
    }
    return a;
}
int main()
{
    int n,x,y,i;
    fin>>n;
    for(i=1;i<=n;i++){
        fin>>x>>y;
        fout<<cmmdc(x,y)<<"\n";
    }
    return 0;
}