#include < iostream >
#include < string >
using   namespace  std;


#define  N 1999
int  len;
char  s[ 30001 ];
int  main()
{
     // freopen("1098.in","r",stdin);
     // freopen("1098.out","w",stdout);
    len = 0 ;
     while (scanf( " %c " , & s[ 0 ]) != EOF){
         if (s[ 0 ] >= '   ' )
            s[ ++ len] = s[ 0 ];
    }
     int  k = 1 ;
     for ( int  i = 2 ;i <= len; ++ i){
        k = (k + N) % i;
         if ( ! k) k = i;
    }
     if (s[k] == ' ? ' )
        printf( " Yes\n " );
     else   if (s[k] == '   ' )
        printf( " No\n " );
     else  printf( " No comments\n " );
     return   0 ;
}