#include<iostream>
#include<cstdio>
#include<cstring>
#include<algorithm>
using namespace std;

int a, b;
int gcd(int a, int b)  //辗转相除
{
    return b != 0 ? gcd(b, a % b) : a;
}

int main()
{
    int T;
    cin >> T;
    while(T --)
    {
        cin >> a >> b;
        cout << gcd(a, b) << endl;
    }
    return 0;
}