#include <iostream>
#include <fstream.h>

using namespace std;

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

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

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





    return 0;
}