#include <bits/stdc++.h>

using namespace std;

int main()
{
    ios_base::sync_with_stdio(0);cin.tie(0);cout.tie(0);
    freopen("euclid2.in","r",stdin);
    freopen("euclid2.out","w",stdout);
    int t;
    cin>>t;
    while(t--)
    {
        int a,b;
        cin>>a>>b;
        cout<<__gcd(a,b)<<"\n";
    }
}