#include<bits/stdc++.h>
using namespace std;
inline int strcmpa(char *s,char *t)
{
 int i;int ans=0;
 for(i=0;s[i]==t[i];i++,ans++)
   if(s[i]!='\0') ans++;
 return ans+1;
}
const int maxn=1010,maxlen=1000000;
int t,n,m,cnt=1;
char a[maxn][maxlen];
inline int Main(){
	freopen("strcmp.in","r",stdin);
	freopen("strcmp.out","w",stdout);
	while(520){
		scanf("%d",&n);if (n==0) break;
		for (int i=1;i<=n;i++){
			scanf("%s",a[i]);
		}
		long long ans=0;
		for (int i=2;i<=n;i++){
			for (int j=1;j<i;j++){
				ans+=strcmpa(a[i],a[j]);
			}
		}
		printf("Case %d: %lld\n",cnt,ans); 
	}
}
int main(){;}
int mylove=Main();