#include <iostream>
#include <fstream>

using namespace std;

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

int gcd(int a,int b) {
    if(b==0)
        return a;
    else
        return gcd(b,a%b);
}

int main()
{
    int n, a,b;
    fin>>n;
    for(int i=0; i < n;i++)
        {fin>>a>>b;
        fout<< gcd(a,b)<<endl;
        }
    return 0;
}