#include<bits/stdc++.h>
using namespace std;
int gcd(int a,int b)
{
    if(b!=0)
    {
        return gcd(b,a%b);
    }
    return a;
}
int main()
{
    int x;
    cin>>x;
    while(x--)
    {
        int a,b;
        cin>>a>>b;
        cout<<gcd(a,b)<<endl;
    }
    return 0;
}