/* RCS Info: $Revision: 1.1 $ on $Date: 89/03/15 11:17:10 $
 *           $Source: /yew3/faustus/src/scrabble/RCS/plural.c,v $
 * Copyright (c) 1989 Wayne A. Christopher, U. C. Berkeley CS Dept
 *      faustus@renoir.berkeley.edu, ucbvax!faustus
 * Permission is granted to modify and re-distribute this code in any manner
 * as long as this notice is preserved.  All standard disclaimers apply.
 *
 * This program reads words from standard input and pluralizes them.
 */

#include <stdio.h>
#include <strings.h>

struct {
       char *end;
       char *new;
} endings[] = {
       { "s",          "ses" },
       { "x",          "xes" },
       { "z",          "zes" },
       { "ch",         "ches" },
       { "sh",         "shes" },
       { "ey",         "eys" },
       { "y",          "ies" },
       { "",           "s" }
} ;

void
pluralize(char *word)
{
       int i, wl, sl;
       char *s, *t;

       for (i = 0; i < sizeof (endings) / sizeof (endings[0]); i++) {
               for (s = word, wl = 0; *s; s++, wl++)
                       ;
               for (t = endings[i].end, sl = 0; *t; t++, sl++)
                       ;
               if (sl > wl)
                       continue;
               s -= sl;
               for (t = endings[i].end; *t; t++, s++)
                       if (*s != *t)
                               break;
               if (!*t) {
                       s -= sl;
                       for (t = endings[i].new; *t; t++, s++)
                               *s = *t;
                       *s = '\0';
                       break;
               }
       }
}

main()
{
       char buf[512];

       while (fgets(buf, 512, stdin)) {
               buf[strlen(buf) - 1] = '\0';
               pluralize(buf);
               printf("%s\n", buf);
       }

       exit(0);
}