#include<stdio.h>

#include<string.h>

#include<algorithm>

using namespace std;

#define maxn 1000

int a[maxn];

int main()

{

    int i,j,t,n,ff=;

    scanf("%d",&t);

    while(t--)

    {

        scanf("%d",&n);

        for(i=;i<n;i++)

        {

            scanf("%d",&a[i]);

        }

        sort(a,a+n);

        int maxx=;

        for(i=;i<n;i++)

        {

            if(a[i]-a[i-]>maxx)

                maxx=a[i]-a[i-];

        }

        printf("Class %d\n",++ff);

        printf("Max %d, Min %d, Largest gap %d\n",a[n-],a[],maxx);

    }

}