#include <iostream>
#include <fstream>
using namespace std;
ifstream f("euclid2.in");
ofstream g("euclid2.out");
long long cmmdc(long long a,long long b)
{
    while(b!=0)
    {
        int r=a%b;
        a=b;
        b=r;
    }
    return a;
}
int main()
{
    int n;
    long long a,b;
    f>>n;
    for(int i=1;i<=n;i++)
    {
        f>>a>>b;
        g<<cmmdc(a,b)<<endl;
    }
    f.close();
    g.close();
    return 0;
}