#include <cstdio>
using namespace std;

long long int euclid(long long int a,long long int b)
{
    if(!b) return a;
    else return euclid(b,a%b);
}

int main()
{freopen("euclid2.in","r",stdin);
freopen("euclid2.out","w",stdout);
long long int t,a,b;
scanf("%lld",&t);
for(int i=1;i<=t;i++)
    {
        scanf("%lld%lld",&a,&b);
        printf("%lld\n",euclid(a,b));
    }
return 0;
}