#include <iostream>
#include <fstream>
using namespace std;

ifstream fin("euclid2.in");
ofstream fout("euclid2.out");

int cmmdc(int a, int b)
{
    int r;
    while (b)
    {
        r = a % b;
        a = b;
        b = r;
    }
    return a;
}
int main()
{
    int t, a, b;
    fin>>t;
    for(int i=0; i<t; i++)
    {
        fin>>a>>b;
        fout<<cmmdc(a, b)<<"\n";
    }
    return 0;
}