#include <iostream>
#include <fstream>
using namespace std;

ifstream in("euclid2.in");
ofstream out("euclid2.out");

int euclid(int a,int b)
{
        if(b)
            return euclid(b,a%b);
        return a;
}
int main()
{   int n,a,b;
     in>>n;
     for(int i=1;i<=n;i++)
     {
            in>>a>>b;
            out<<euclid(a,b)<<endl;
     }
    return 0;
}