#include <iostream>
#include <fstream>
using namespace std;
ifstream fin("euclid2.in");
ofstream fout("euclid2.out");
int main()
{
    unsigned t,a,b;
fin>>t;
for(int i=1;i<=t;i++)
{
    fin>>a>>b;
    while(a!=b)
    {
        if(a>b)
            a=a-b;
        else
            b=b-a;
    }
    fout<<a<<endl;
}
fin.close();
fout.close();
    return 0;
}