#include <fstream>
using namespace std;
ifstream f("euclid2.in");
ofstream g("euclid2.out");
int a,b,T;
int gcd(int a,int b)
{
if(!b) return a;
return gcd (b, a%b);
}
int main(void)
{
f>>T;
for(; T; --T)
{
f>>a>>b;
g<<gcd(a,b)<<endl;
}
return 0;
}