#include <iostream>
#include <fstream>

using namespace std;

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

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

int main()
{
    int a,b,n;
    f>>n;
    for(int i=1;i<=n;i++)
    {
        f>>a>>b;
        g<<cmmdc(a,b)<<'\n';
    }
    return 0;
}