> #include<stdio.h>
> #define MAXLEN 256
> int main()
> {
>   char s[MAXLEN];
>   int i,flag;
>   while(scanf("%s",s)==1/* 1*/)
>     {
>       for(i=0;s[i]!=0;i++);
>       /* *********************
>          for(i=0;(s[i]=getchar())!='\n';i++)
> 	    if(s[i]==EOF) return(0);
>        ********************** */
>       flag=0;
>       for(i--;i>=0;i--)
> 	    {
> 	      if(s[i]>='p'&&s[i]<='z'){++flag;continue;}
> 	      if(s[i]=='N')
>            {if(flag>=1)continue;else break;}
> 	      if(s[i]=='C'||s[i]=='D'||s[i]=='E'||s[i]=='I')
> 	       {if(flag>=2)--flag;else {flag=0;break;}}
> 	      else{flag=0; break;}
> 	    }
>       if(flag==1)printf("YES\n");else printf("NO\n");
>     }
> }