#include <iostream>
#include <fstream>
using namespace std;
ifstream fin("euclid2.in");
ofstream fout("euclid2.out");

int euclid(int a,int b)
{
    if(b==0) return a;
    else return euclid(b,a%b);
}
int main()
{
    long int t,a,b;
    fin>>t;
    for(int i=1;i<=t;i++)
    {
        fin>>a>>b;
        fout<<euclid(a,b)<<endl;
    }
    return 0;
}