#include <fstream>

using namespace std;
ifstream fin("euclid2.in");
ofstream fout("euclid2.out");
int main();
int cmmdc(int a,int b)
{
int x,y,r;
x=a;y=b;
while(y!=0)
{
    r=x%y;
    x=y;
    y=r;
}
return x;
}
int main()
{
    int T,i,a,b,z;

    fin>>T;
   for(i=1;i=T;i=i+1)
    {
        fin>>a>>b;
        z=cmmdc(a,b);
        fout<<z<<"\n";
    }
    fout.close();
    fin.close();
return 0;
}