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

int euclid (int a,int b){
    int c;
    while (b) {
        c = a % b;
        a = b;
        b = c;
    }
    return a;
}
int a,b,t,rez;
int main(){
    fin>>t;
    for(int i=1;i<=t;i++){
        fin>>a>>b;
        rez=euclid(a,b);
        fout<<rez<<'\n';
    }
}