#include <iostream>
#include <fstream>
using namespace std;
ifstream f("euclid2.in");
ofstream g("euclid2.out");
int t, a, b;
int cmmdc(int a, int b)
{   int c;
    while(b!=0)
    {
       c=b;
       b=a%b;
       a=c;
    }
    return a;
}
int main()
{   f>>t;
    for(int i=1; i<=t; i++)
    {
        f>>a>>b;
        g<<cmmdc(a,b)<<endl;
    }
    return 0;
}