#include <fstream.h>
int t,a,b,i;
int cmmdc (int &a ,int &b)
{if (b==0)
return a;
return cmmdc (b,a%b);
}

int main()
{ifstream f("euclid2.in");
ofstream g("euclid2.out");
f>>t;
for(i=1;i<=t;i++)
	{f>>a>>b;
	g<<cmmdc (a,b)<<'\n';
	}
f.close();
g.close();
return 0;
}