#include <iostream>
#include <fstream>

using namespace std;

ifstream f("euclid2.in");
ofstream g("euclid2.out");

int n;

int cmmdc(int a,int b)
{
    int r;
    while(b)
    {
        r=a%b;
        a=b;
        b=r;
    }
    return a;
}

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