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

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

int cmmdc(int a,int b)
{
    int r;
    while (b!=0)
    {
        r=a%b;
        a=b;
        b=r;
    }
    return a;
}

int main()
{
    int t, a, b;
    fin>>t;
    while (t>0)
    {
        fin>>a>>b;
        fout<<cmmdc(a,b)<<'\n';
        t--;
    }
    
    
    return 0;
}