#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!=0){
        r = a % b;
        a = b;
        b = r;
    }
    return a;
}
int main()
{
    int i, a, b, n;
    f>>n;
    for(i=1;i<=n;++i){
        f>>a>>b;
        g<<cmmdc(a, b)<<'\n';
    }
    return 0;
}