#include <iostream>
#include <fstream>
using namespace std;
ifstream fin("euclid2.in");
ofstream fout("euclid2.out");
int cmmdc (int a, int b){
    while (b){
        int r=a%b;
        a=b;
        b=r;
    } return a;
}
int main()
{
        int t,a,b;
        fin>>t;
        while (t--){
                fin>>a>>b;
            fout<< cmmdc(a,b)<<"\t"<<endl;
        }

    return 0;
}