#include <iostream>
#include <fstream>

using namespace std;

int n;
ifstream in("euclid2.in");
ofstream out("euclid2.out");

int cmmdc(int a, int b)
{
    if(a == 0)
        return b;
    while(b != 0)
    {
        if(a > b) a -= b;
        else b -= a;
    }
    out << a << "\n";
}

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