#include <fstream>
#include <vector>
#include <cmath>
#include <cstring>
#include <utility>
#include <algorithm>


using namespace std;

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

int cmmdc(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,x,y;
f>>n;
for(i=1;i<=n;i++)
{
    f>>x>>y;
    g<<cmmdc(x,y)<<endl;
}



    return 0;
}