#include <iostream>
#include <fstream>
using namespace std;
int euclid(int a,int b)
{
    int r;
    do{
        r=a%b;
        a=b;
        b=r;
    }while(r);
    return a;
}
int main()
{
    ifstream f("euclid2.in");
    ofstream g("euclid2.out");
    int a,b,n;
    f>>n;
    while(n){
        n--;
        f>>a>>b;
        g<<euclid(a,b)<<endl;
    }
}