#include <iostream>
#include<fstream>
using namespace std;
int algoritm(int x,int y){
if(x==y)
return x;

if(x>y)
algoritm(x-y,y);
else algoritm(x,y-x);}

int main()
{
    int a,b;
    long int n;
    ifstream f("euclid2.in");

    ofstream g("euclid2.out");
 f>>n;
while(n){
 f>>a>>b;  g<< algoritm(a,b)<<endl;
 n--;}
    f.close();
    g.close();
    return 0;
}