#include <iostream>
#include <fstream>
using namespace std;
ifstream f("euclid2.in");
ofstream g("euclid2.out");
int n, x, y;
/*int cmmdc(int a, int b)
{
    while(b!=0)
    {
        int r=a%b;
        a=b;
        b=r;

    }
    return a;
}*///trebuie recursiv

int cmmdc(int a, int b)
{
    if(b==0)
        return a;
    else
        return cmmdc(b,a%b);
}

int main()
{
    f>>n;
    for(int i=1; i<=n; i++)
    {
        f>>x>>y;
        g<<cmmdc(x,y)<<endl;
    }
    return 0;
}