#include <bits/stdc++.h>

using namespace std;



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

long long int t, a, b;

int main()
{
    ifstream cin("euclid2.in");
    ofstream cout("euclid2.out");

    cin>>t;
    for(int i=1; i<=t; i++)
    {
        cin>>a>>b;
        cout<<cmmdc(a, b)<<endl;
    }

    return 0;
}