#include <iostream>
#include <fstream>
using namespace std;
ifstream fin("cmmdc.in");
ofstream fout("cmmdc.out");
int a, b, r, i, n;
int main()
{
    fin>>n;
    for (i=1; i<=n; i++)
    {
        fin>>a>>b;
        r=a%b;
        while (r!=0)
        {
            a=b;
            b=r;
            r=a%b;
        }
        fout<<b;
    }
    fin.close();
    fout.close();

    return 0;
}