#include <iostream>
#include <fstream>

using namespace std;

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

int n, a, b;

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