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