#include <iostream>
#include <fstream>


using namespace std;

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

int euclid(int a,int b)
{
    int c;
    while(b){
        c = a % b;
        a = b;
        b = c;
    }
    return a;
}

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