//#include <iostream>
#include <fstream>
using namespace std;

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

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

}
int main()
{
    int n,i,a,b;
    cin>>n;
    for(i=1;i<=n;i++)
    {
        cin>>a>>b;
        cout<<func(max(a,b),min(a,b))<<'\n';
    }
    return 0;
}