#include <iostream>
#include <fstream>
using namespace std;
ifstream fin("euclid2.in");
ofstream fout("euclid2.out");
int gcd(int a,int b)
{
    if(a%b==0)
        return b;
    else
        return gcd(b,b%a);
}
int main()
{
    int n,a,b;
    fin>>n;
    for(int i=1; i<=n; i++)
    {
        fin>>a>>b;
        fout<<gcd(a,b)<<'\n';
    }
    return 0;
}