/*
Kim Code

Simple cypher. Each letter replaced by one letter before it. 'z' rotates to 'a'

*/
#include<stdio.h>

int main(void)
{
  char c;
  c = getchar();

  while (c != EOF) {
    if ((c >= 'b') && (c <= 'z')) {
      c--;
      putchar(c);
    } else if ((c >= 'B') && (c <= 'Z')) {
      c--;
      putchar(c);
    } else if (c == 'a') {
      putchar('z');
    } else if (c == 'A') {
      putchar('Z'); 
    } else {
      putchar(c);
    }

    //get next char
    c = getchar();
  }
  return(0);
}