/*
letter_count.c

A program to count letters in input.
(Type CTRL-D to terminate input.)
*/

#include <stdio.h>

main()
{
int c ;
int count ;

count = 0 ;
while ( ( c = getchar() ) != EOF )
  if ( ( c >= 'A' ) && ( c <= 'Z' ) ||
       ( c >= 'a' ) && ( c <= 'z' ) ) 
    count ++ ;

printf( "%d letters\n" , count ) ;
}