#include <iostream>
#include <fstream>
using namespace std;
    ifstream fin("euclid2.in");
    ofstream gout("euclid2.out");
long long nr, a, b,i;
/*int heuclid (int a, int b) {
    while (a!=b)
    if (a>b)
        a=a-b;
    else
        b=b-a;
    return a;
}*/
    int heuclid(int a, int b)
{
    long long c;
    while (b) {
        c = a % b;
        a = b;
        b = c;
    }
    return a;
}

int main() {
    fin>>nr;
    for (i=1;i<=nr;i++)
    {
    fin>>a;
    fin>>b;
    gout<<heuclid (a,b)<<"\n";
    }
}