#include <iostream>
#include <fstream>

using namespace std;
ifstream f("euclid2.in");
ofstream g("euclid2.out");
int cmmdc(int a,int b)
{

    int c;
    while(b)
    {
        c=a%b;
        a=b;
        b=c;

    }
    return a;

}


int main()
{
    int t,a,b,i;
    f>>t;
    for(i=1;i<=t;i++)
    {
        f>>a>>b;
        g<<cmmdc(a,b)<<"\n";
    }
}