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

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

int n;

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

int main()
{
    fin>>n;
    for (int i=1;i<=n;i++)
    {
        int x,y;
        fin>>x>>y;
        fout<<cmmdc(x,y)<<'\n';
    }
}