#include <fstream>

using namespace std;

ifstream f("euclid2.in");
ofstream g("euclid2.out");

int cmmdc(int a, int b){
    int r;
    r=a%b;
    while(r!=0){
        a=b;
        b=r;
        r=a%b;
    }
    return b;
}


int main()
{
    int a, b, t, i;
    f>>t;
    for(i=1; i<=t; i++)
    {
        f>>a>>b;
        g<<cmmdc(a, b)<<"\n";
    }
    return 0;
}