#include <iostream>
#include <fstream>
#include <vector>
#include <algorithm>

using namespace std;

ifstream fin("euclid2.in");
ofstream fout("euclid2.out");

int n,a,b;

inline int Euclid(int a, int b)
{
    while(b!=0)
    {
        int r=a%b;
        a=b;
        b=r;
    }
    return a;
}

int main()
{
    fin>>n;
    for(int i=1;i<=n;i++)
    {
        fin>>a>>b;
        fout<<Euclid(a,b)<<'\n';
    }
}