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