#include <iostream>
#include <fstream>

using namespace std;

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

int main()
{
    ifstream fin("euclid2.in");
    ofstream fout("euclid2.out");
    int n,i,x,y;
    fin>>n;
    for(i=1;i<=n;i++)
        {
            fin>>x>>y;
            fout<<cmmdc(x,y)<<"\n";
        }
    return 0;
}