#include <iostream>
#include <fstream>

using namespace std;

int cmmdc(int a, int b)
{
    while(b!=0)
    {
        int r=a%b;
        a=b;
        b=r;
    }
    return a;
}

int main()
{
    ifstream fin ("euclid2.in");
    ofstream fout("euclid2.out");
    int t, a, b;
    fin>>t;
    for(int i=1; i<=t; i++)
    {
        fin>>a>>b;
        fout<<cmmdc(a,b)<<"\n";
    }
    return 0;
}