> #include<iostream.h>
> #include<string.h>
> int main()
> {
> 	char a[20];
> 	int r=0,n=0;
> 	while(cin>>a)
> 	{
> 		char b[20][20];
> 		if(strcmp(a,"9")!=0)strcpy(b[n++],a);
> 		else 
> 		{
> 		   int i,j,k,s=0;
> 		   r++;
> 		   for(i=0;i<n-1;i++)
> 		   {
> 			  int c=strlen(b[i]);
> 			  for(j=0;j<n-1;j++)
> 			  {
> 				if(j!=i)
> 				{
> 				   for(k=0;k<c;k++)
> 				   {
> 					if(b[j][k]==b[i][k])continue;
> 					else break;
> 				   }
> 			 	   if(k==c)s++;
> 				}
> 			  }
> 		   }
> 		    if(s==0)cout<<"Set "<<r<<" is immediately decodable"<<endl;
> 		        else cout<<"Set "<<r<<" is not immediately decodable"<<endl;
> 		   n=0;
> 		}
> 	}
> 	return 1;
> }
>