> #include <iostream.h>
> 
> 
> void main(){
>   int min = 0;
>   char a[27];
>   int b[26];
>   int i,j,n;
>   
>    while(cin>>n&&n){
> 	   for(i=0;i<=n-1;i++){b[i] = 1;}
>      for(i=1;i<=n;i++)
> 	 { 
> 	   cin>>a;
>        j = 2;
> 	   while(a[j])
> 	   {
> 		   //if(a[j]>a[0])
> 		   //{
> 		    if(b[(int)a[0]-65]==b[(int)a[j]-65])
> 				b[(int)a[j]-65]++;
> 		   //} 
> 		   j++;
> 	   }
> 	 }min = 0;
>      for(i=0;i<=n-1;i++){if(min<b[i])min = b[i];}
>      if(min==1){cout<<"1 channel needed.\n";}
> 	 else cout<<min<<" channels needed."<<endl;
> 
>    }
> }