import java.util.*;
public class Main{
public static void main(String[] args) {
Scanner sc=new Scanner(System.in);
String s=sc.nextLine();
if(s.equals(""))
System.out.println("NULL");
else {
char[] b=s.toCharArray();
for(int i=0;i<b.length;i++) {
if(b[i]>='A'&&b[i]<='E')
b[i]+=21;
else if(b[i]>='F'&&b[i]<='Z')
b[i]-=5;
}
String c=new String(b);
System.out.println(c);
}
}
}