#include <stdio.h>
#define BUFSIZE 10
main (void) {
   char buf[BUFSIZE];
   char *bp;
   int n,nread;

     while ((n = nread = read(stdin,buf,BUFSIZE))) {
       for (bp=buf; n--;bp++) {
         if (*bp == 'x') *bp='y';
         }
       write(stdout,buf,nread);
       } 
   }