#include <iostream>
#include <fstream>

using namespace std;

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

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

int n,a,b;


int main()
{
    fin>>n;
    while(fin>>a>>b) fout<<cmmdc(a, b)<<"\n";
}