#include <iostream>
#include <fstream>
 
using namespace std;
 
int gcd(int a, int b) {
    if(!b) return a;
    else return gcd(a%b, b);
}
 
int main() {
     
    int a,b,n;
     
    ifstream in ("euclid2.in");
    ofstream out ("euclid2.out");
     
    in >> n;
     
    for(int i=0; i < n; i++) {
        in >> a >> b;
        out << gcd(a,b) << endl;
    }
     
    in.close();
    out.close();
     
    return 0;
}