#include <iostream>
#include <fstream>
using namespace std;
ifstream fin("euclid2.in");
ofstream fout("euclid2.out");
int a,b;
int euclid(int a, int b){
    int c;
    while (b!=0) {
        c=a%b;
        a=b;
        b=c;
    }
    return a;
}

int main()
{ int t;
    fin>>t;
    for (int i=1; i<=t; i++){
        fin>>a>>b;
        fout<<euclid(a,b)<<endl;
        }
    return 0;
}