#include <bits/stdc++.h>

using namespace std;
ifstream fin ("euclid2.in");
ofstream fout("euclid2.out");
int a,b,T,tmp;
int main()
{
    fin>>T;
    while(T){
        fin>>a>>b;
        while(b>0)
        {
            tmp=b;
            b=a%b;
            a=tmp;
            
        }
        T--;
        fout<<a<<"\n";
    }
    
    
    return 0;
}