#include <fstream>
using namespace std;
int cmmdc(int a, int b)
{
    int c;
    while (b!=0)
    {
        c=b;
        b=a%b;
        a=c;
    }
    return a;
}

int main ()
{
    ifstream f("euclid2.in");
    ofstream g("euclid2.out");
    int a,b,t,i; f>>t;
    for (i=1; i<=t; i++)
    {
        f>>a>>b;
    g<<cmmdc(a,b)<<endl;
    }
    return 0;
}