#include<cstdio>

 #include<cstring>

 bool vis[][];

 int ans,h,w,T,TT;

 char s[][];

 void dfs(int x,int y)

 {

     vis[x][y]=;

     ans++;

     if(x>&&!vis[x-][y])    dfs(x-,y);

     if(x<h&&!vis[x+][y])    dfs(x+,y);

     if(y>&&!vis[x][y-])    dfs(x,y-);

     if(y<w&&!vis[x][y+])    dfs(x,y+);

 }

 int main()

 {

     int i,j,sx,sy;

     scanf("%d",&T);

     for(TT=;TT<=T;TT++)

     {

         scanf("%d%d",&w,&h);

         if(w==||h==)

         {

             printf("Case %d: %d\n",TT,);

             continue;

         }

         ans=;

         memset(s,,sizeof(s));

         memset(vis,,sizeof(vis));

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

             scanf("%s",s[i]+);

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

             for(j=;j<=w;j++)

                 if(s[i][j]=='#')

                     vis[i][j]=;

                 else if(s[i][j]=='@')

                 {

                     sx=i;sy=j;

                 }

         dfs(sx,sy);

         printf("Case %d: %d\n",TT,ans);

     }

     return ;

 }