#include<iostream>
#include<algorithm>
#include<cstring>
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;
        scanf("%d%d",&a,&b);
        auto t=gcd(a,b);
        printf("%d\n",t);
    }

    return 0;
}