#include <fstream>
using namespace std;

ifstream fin("euclid2.in");
ofstream fout("euclid2.out");

int cmmdc(int a, int b){
    while (b!=0){
        int r = a%b;
        a = b;
        b = r;
    }
    return a;
}
int main(){
    int n;
    fin>>n;

    for (int i = 1; i<=n; i++){
        int a,b;
        fin>>a>>b;

        fout<<cmmdc(a,b)<<'\n';
    }
}