#include <iostream>
#include <fstream>
using namespace std;

int cmmdc(int a,int b)
{
    if (a%b==0) return b;
        else return (cmmdc(b,a%b));
}
int main()
{
    int t,a,b;
    ifstream f("euclid2.in");
    ofstream g("euclid2.out");
    f>>t;
    for (int i=1; i<=t; i++)
    {
        f>>a>>b;
        g<<cmmdc(a,b)<<endl;
    }
    return 0;
}