# include <cstdlib>
# include <iostream>

using namespace std;

int main ( )
//
//  LONGEST_WORD is a program which reads input until end-of-file.
//
//  It keeps track of the longest word it has read (defined as 
//  consecutive alphabetic characters), and prints that length at the end.
//
//  The check that the character C is alphabetic uses the fact that
//  the alphabetic characters satisfy 'A'<=c<='Z' or 'a'<=c<='z'.
//
{
  char c;
  int length = 0;
  int length_max = 0;

  while ( true )
  {
    c = cin.get ( );

    if ( cin.eof ( ) )
    {
      break;
    }
//
//  The following check can be replaced by 
//    if ( isalpha ( c ) )
//  but then we also have to # include <cctype>
//
    if ( ( 'A' <= c && c <= 'Z' ) || ( 'a' <= c && c <= 'z' ) )
    {
      length = length + 1;
    }
    else
    {
      if ( length_max < length )
      {
        length_max = length;
      }
      length = 0;
    }
  }

  cout << "Longest word has length " << length_max << ".\n";
  return 0;
}