#include <fstream>
using namespace std;
ifstream cin("euclid2.in");
ofstream cout("euclid2.out");
int cmmdc(int a,int b){
    int r;
    while(b!=0){
        r=a%b;
        a=b;
        b=r;
    }
    return a;
}
int main()
{
    int t;
    cin>>t;
    while(t--){
        int a,b;
        cin>>a>>b;
        cout<<cmmdc(a,b)<<'\n';
    }
    return 0;
}