#include <iostream>
#include <fstream>
using namespace std;
ifstream in ("euclid2.in");
ofstream out ("euclid2.out");
int cmmdc (int a, int b)
{
    int r=0;
    while(b)
    {
        r=a%b;
        a=b;
        b=r;
    }
    return a;
}
int a,b,n,i;
int main()
{
    in>>n;
    for(i=1;i<=n;i++)
    {
        in>>a>>b;
        out<<cmmdc(a,b)<<"\n";
    }
    return 0;
}