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

    }
    return 0;
}