#include <iostream>
#include <fstream>
using namespace std;
int gcd(int a ,int b)
{
    if(b==0)
        return a;
    return gcd(b,a%b);
}
int main()
{
    ifstream f("euclid2.in");
    ofstream g("euclid2.out");
    int n,a,b;
    f>>n;
    for(int i=0;i<n;i++)
    {
        f>>a>>b;
        g<<gcd(a,b)<<"\n";
    }
    return 0;
}