#include <iostream>
#include <fstream>
using namespace std;
ifstream f("euclid2.in");
ofstream g("euclid2.out");
int cmmdc(int a, int b)
{
    if(!b)
        return a;
        else
            return cmmdc(b,a%b);
}
int main()
{
    int n,a,b,i;
    f>>n;
    for(i=1;i<=n;i++)
    {
        f>>a>>b;
        g<<cmmdc(a,b)<<'\n';

    }
    f.close();
    g.close();
    return 0;
}