#include <bits/stdc++.h>

using namespace std;
ifstream fin ("euclid2.in");
ofstream fout ("euclid2.out");
int euclid (int a, int b)
{
    int r;
    while (b) {
        r=a%b;
        a=b;
        b=r;
    }
    return a;
}
int main()
{
    long long t,a,b;
    fin>>t;
    for (int i=1;i<=t;i++) {
        fin>>a>>b;
        fout<<euclid(a,b)<<"\n";
    }
    return 0;
}