#include <iostream>
#include <fstream>

using namespace std;

ifstream f("euclid2.in");
ofstream g("euclid2.out");

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

int main()
{
int i,n,a,b;
f>>n;
for(i=1;i<=n;i++)
{
f>>a>>b;
g<<euclid(a,b)<<endl;
}
return 0;
}