#include <fstream>

using namespace std;
ifstream in("euclid2.in");
ofstream out("euclid2.out");
int cmmdc(int a, int b)
{
    while(b)
    {
        int r=a%b;
        a=b;
        b=r;
    }
    return a;
}

int main()
{
    int n, a, b;
    in>>n;
    for(int i=1; i<=n; i++)
    {
        in>>a>>b;
        out<<cmmdc(a,b)<<'\n';
    }


    return 0;
}