#include <iostream>
#include <fstream>
using namespace std;
int main()
{
    int a,b,i,j,T,d;
    ifstream f("euclid2.in");
    ofstream g("euclid2.out");
    f>>T;
    for(i=1;i<=T;i++)
    {
        f>>a;
        f>>b;
        while(a!=b)
        {if(a>b)
        a=a-b;
        else
            b=b-a;}
g<<a<<endl;
    }
f.close();
g.close();
return 0;
}