#include<cstring>
#include<cstdio>
#include<iostream>
#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;
        scanf("%d%d",&a,&b);
        printf("%d\n",gcd(a,b));
    }
    return 0;
}