#include<fstream>

using namespace std;

int euclid(int a,int b)
{
if(b==0)
return a;
return euclid(b,a%b);
}

int main()
{
ifstream f("euclid2.in");
ofstream g("euclid2.out");
int n,a,b;
f>>n;
for(;n;n--)
{
f>>a>>b;
g<<euclid(a,b)<<endl;
}
f.close();
g.close();
return 0;
}