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

ifstream f("euclid2.in");
ofstream g("euclid2.out");

int cmmdc(int a, int b)
{
    if(!b) return a;
    else return cmmdc(b,a%b);
}

int main()
{
    int n;
    int a,b;
    f>>n;
    for(int i = 1; i<=n; i++)
    {
        f>>a>>b;
        g<<cmmdc(a,b)<<"\n";
    }
    return 0;
}