wHAT DO WE NEED cAPS LOCK FOR?

Caps lock is a computer keyboard key. Pressing it sets an input mode in which typed letters are capital by default. If it is pressed by accident, it leads to accidents like the one we had in the first passage. 

Let's consider that a word has been typed with the Caps lock key accidentally switched on, if: 

  * either it only contains uppercase letters; 
  * or all letters except for the first one are uppercase. 



In this case we should automatically change the case of all letters. For example, the case of the letters that form words "hELLO", "HTTP", "z" should be changed.

Write a program that applies the rule mentioned above. If the rule cannot be applied, the program should leave the word unchanged.

Input

The first line of the input data contains a word consisting of uppercase and lowercase Latin letters. The word's length is from 1 to 100 characters, inclusive.

Output

Print the result of the given word's processing.

Examples

Input

cAPS


Output

Caps

Input

Lock


Output

Lock
    import java.awt.*;
    import java.awt.geom.*;
    import java.io.*;
    import java.text.*;
    import java.util.*;
    import java.util.regex.*;

    public class Main{
        static class Run implements Runnable{
            //TODO parameters
            final boolean consoleIO = true;
            final String inFile = "input.txt";
            final String outFile = "output.txt";
            
            String s;
            int len;
            
            void inverse() {
                StringBuilder b = new StringBuilder(s);
                
                for(int i = 0; i < len; ++i) {
                    char ch = b.charAt(i);
                    if(Character.isLowerCase(ch))
                        ch = Character.toUpperCase(ch);
                    else
                        ch = Character.toLowerCase(ch);
                    
                    b.setCharAt(i,ch);
                }
                
                s = b.toString();
            }
            
            boolean ok1() {
                boolean ok = Character.isLowerCase(s.charAt(0));
                if(!ok)
                    return false;
                
                for(int i = 1; i < len; ++i)
                    if(Character.isLowerCase(s.charAt(i)))
                        return false;
                
                return true;
            }
            
            boolean ok2() {
                for(int i = 0; i < len; ++i)
                    if(Character.isLowerCase(s.charAt(i)))
                        return false;
                
                return true;
            }
            
            @Override
            public void run() {
                s = nextLine();
                len = s.length();
                
                if(ok1()||ok2())
                    inverse();
                
                print(s);
                close();
            }
        //=========================================================================================================================
            BufferedReader in;
            PrintWriter out;
            StringTokenizer strTok;
           
            Run() {
                if (consoleIO) {
                    initConsoleIO();
                }
                else {
                    initFileIO();
                }
            }
           
            void initConsoleIO() {
                in = new BufferedReader(new InputStreamReader(System.in));
                out = new PrintWriter(new OutputStreamWriter(System.out));
            }
           
            void initFileIO() {
                try {
                    in = new BufferedReader(new FileReader(inFile));
                    out = new PrintWriter(new FileWriter(outFile));
                } catch (FileNotFoundException e) {
                    e.printStackTrace();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
           
            void close() {
                try {
                    in.close();
                    out.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
           
            int nextInt() {
                return Integer.parseInt(nextToken());
            }
           
            double nextDouble() {
                return Double.parseDouble(nextToken());
            }
           
            float nextFloat() {
                return Float.parseFloat(nextToken());
            }
           
            long nextLong() {
                return Long.parseLong(nextToken());
            }
           
            String nextLine() {
                try {
                    return in.readLine();
                } catch (IOException e) {
                    return "__NULL";
                }
            }
           
            boolean hasMoreTokens() {
                return (strTok == null) || (strTok.hasMoreTokens());
            }
           
            String nextToken() {
                while (strTok == null || !strTok.hasMoreTokens()) {
                    String line;
                    try {
                        line = in.readLine();
                        strTok = new StringTokenizer(line);
                    } catch (IOException e) {
                        e.printStackTrace();
                    }
                }
               
                return strTok.nextToken();
            }
           
            void cout(Object o){
                System.out.println(o);
            }
           
            void print(Object o) {
                out.write(o.toString());
            }
            
            void println(Object o) {
                out.write(o.toString() + '\n');
            }
           
            void printf(String format, Object... args) {
                out.printf(format, args);
            }
           
            String sprintf(String format, Object... args) {
            return MessageFormat.format(format, args);
        }
        }
       
        static class Pair<A, B> {
            A a;
            B b;
           
            A f() {
                return a;
            }
           
            B s() {
                return b;
            }
           
            Pair(A a, B b) {
                this.a = a;
                this.b = b;
            }
           
            Pair(Pair<A, B> p) {
                a = p.f();
                b = p.s();
            }
        }
       
        public static void main(String[] args) throws IOException {
            Run run = new Run();
            Thread thread = new Thread(run);
            thread.run();
        }
    }