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#include<fstream>
using namespace std;
ifstream fin("euclid2.in");
ofstream fout("euclid2.out");
int cmmdc(int a, int b) 
   {
        while(b!=0) 
        {
        int d=a%b;
        a=b;
        b=d;
        }
    return a;
   }
int n, a, b; 
int main()
{
    fin>>n;
    for(int i=1;i<=n;i++)
    {
     fin>>a>>b;
    fout<<cmmdc(a,b)<<"\n";
    }
    fin.close();
    fout.close();
    return 0;
}