#include <iostream>
#include <fstream>

using namespace std;

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

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

int main()
{
    int a,b,t;
    in>>t;
    for(int i=1;i<=t;i++)
    {
    in>>a>>b;
    out<<euclid(a,b)<<'\n';
    }
}