#include <fstream>

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

int i,a,b,t;

int cmmdc (int a ,int b)
{
    int c=a%b;
    while(c)
    {
        a=b;
        b=c;
        c=a%b;
    }
    return b;
}
int main()
{
    f>>t;
    for(i=1;i<=t;i++)
    {
        f>>a>>b;
        g<<cmmdc(a,b)<<'\n';

    }

    return 0;
}