/* Reverse letters of the words, but not the words themselves  */
/* Version 2: punctuation remains in place */

#include <stdio.h>

#define MAXWORD    40          /* Maximum word size */
enum flags { NO, YES, CAPS, UNDERCAST };

int wordchar(int c);
int w_reverse(char s[], int len, int caps);
int w_write(char s[], int len);

int read_word(void)
{
     int len;                   /* index/length of word[]             */
     int c;                     /* next character of input            */
     int w;                     /* flag: CAPS or UNDERCAST            */
     int caps;                  /* does the word start with Caps ?    */
     int all_caps;              /* is the entire word CAPITAL ?       */
     char word[MAXWORD];        /* the word self                      */

     len = 0;
     caps = all_caps = NO;

     while ((c = getchar()) != EOF)
          if ((w = wordchar(c))) {
               if (w == CAPS) {
                    word[len++] = c;
                    all_caps = YES;
               } else if (w == UNDERCAST) {
                    word[len++] = c;
                    if (all_caps == YES) {      
                         caps = YES;
                         all_caps = NO;        
                    }
               }
          } else if (w == 0) {                  
               if (len) {                       
                    w_reverse(word, len, caps); 
                    w_write(word, len);         
                    len = 0;                    
                    caps = all_caps = NO;       
               }
               putchar(c);
          }
     
     return c;
}

     


int w_reverse(char s[], int len, int caps)
{
     int i, j;
     int swap;
     
     j = len -1;
     i = 0;
     
     if (caps == YES) {             /* swap positions of caps        */
          s[i] = s[i] + 'a' - 'A';  /* convert a Capital to undercast */
          s[j] = s[j] + 'A' - 'a';  /* convert a undercast to Capital */
     }

     while (i < j) {
          swap = s[i];
          s[i++] = s[j];
          s[j--] = swap;
     }
     return 0;

}

int w_write(char s[], int len)
{
     int i;
     
     for (i = 0; i < len; ++i)
          putchar(s[i]);
     return 0;

}

int wordchar(int c)
{

     if (c >= 'A' && c <= 'Z')
          return CAPS;
     else if (c >= 'a' && c <= 'z')
          return UNDERCAST;
     else
          return 0;
     
}

int main(void)
{
     while (read_word() > 0)
          ;
     return 0;
     
}