import java.util.*;
class Main{
    public static void main(String[] args){
        Scanner sc = new Scanner(System.in);
        String s = sc.nextLine();
        for(int i=0;i<s.length();i++){
            char ch = s.charAt(i);
            if(!Character.isLetter(ch)&&!Character.isWhiteSpace(ch)&&Character.isLetterOrDigit(ch)){
                System.out.print("Invalid input");
                return;
            }
        }
        for(int i=0;i<s.length();i++){
            char ch = s.charAt(i);
            if(ch>='a'&&ch<='z'){
                System.out.print((char)('a'+'z'-ch));
            }
            if(ch>='A'&&ch<='Z'){
                System.out.print((char)('A'+'Z'-ch));
            }
            if(ch==' ') System.out.print(ch);
        }
    }
}