#include <iostream>
#include <fstream>
using namespace std;
ifstream f("euclid2.in");
ofstream g("euclid2.out");
int cmmdc(int a, int b){
  if(b==0)return a;
  else return cmmdc(b,a%b);
 }

int main(){
 int T,a,b;
 f>>T;
 while(T--){
 f>>a>>b;
 g<<cmmdc(a,b)<<'\n';
 }
}