/**
********************************************
This code only for beginners.  Please, Don't Copy Past
********************************************
*/
/// uva 11965 solve
 
#include<stdio.h>
#include<string.h>
int main()
{
    int i,j,k, t, a;
    char str[505];
 
    scanf("%d",&t);
    for(i=1; i<=t; i++){
        scanf("%d",&k);
        getchar();
 
        printf("Case %d:\n",i);
        for(j=0; j<k; j++){
            gets(str);                        ///    take input
 
            for( a=0; str[a]!=NULL ; a++){    ///  scaning
                if( str[a]==' ' && str[a-1]==' ' && a!=0)
                    continue;
                else
                   printf("%c",str[a]);
 
            }
            printf("\n");
        }
        if(i!=t)
            printf("\n");
    }
    return 0;
}