#include <iostream>
#include <fstream>
using namespace std;
ifstream fin("euclid2.in");
ofstream fout("euclid2.out");

int gcd(int a,int b) {
        if (!b) return a;
        return gcd(b,a%b);
}

int main() {
        int t,a,b;
        fin>>t;
        for (int i = 1;i<=t;++i) {
                fin>>a>>b;
                fout<<gcd(a,b)<<'\n';
        }
        return 0;
}