#include <iostream>
#include <cstdio>
#include <cstring>
#include <algorithm>
using namespace std;
int gcd(int a,int b)
{
    return b ? gcd(b,a % b) : a;
}
int main()
{
    int n;
    cin >> n;
    while(n --)
    {
        int a,b;
        cin >> a >> b;
        cout << gcd(a,b) << endl;
    }
    return 0;
}