#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!=0)
    {
        c=b;
        b=a%b;
        a=c;
    }
    return a;
}
int main()
{
    int t,i,a,b;
    f>>t;
    for(i=1;i<=t;i++)
    {
        f>>a>>b;
        g<<cmmdc(a,b)<<endl;
    }
    return 0;
}