#include<iostream>
#include<fstream>
using namespace std;
int cmmdc(int a,int b)
{
    if(b==0)
        return a;
    return cmmdc(b,a%b);
}
int main()
{
    ifstream f("euclid2.in");
    ofstream g("euclid2.out");
    int n,a,b,i;
    f>>n;
    for(i=1;i<=n;++i)
       {
           f>>a>>b;
           g<<cmmdc(a,b)<<endl;
       }
       f.close();
       g.close();
       return 0;
}