#include <iostream>
#include <fstream>
using namespace std;

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

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

int main(){
    int t,a,b;
    in>>t;
    for(int i = 0; i < t; i++){
        in>>a>>b;
        out<<cmmdc(a , b)<<"\n";
    }
}