#include <iostream>
#include <fstream>
using namespace std;
ifstream fin("euclid2.in");
ofstream fout("euclid2.out");
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;
}