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.io.OutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.io.PrintWriter;
import java.io.BufferedWriter;
import java.io.Writer;
import java.io.OutputStreamWriter;
import java.util.InputMismatchException;
import java.io.IOException;
import java.io.InputStream;

/**
 * Built using CHelper plug-in
 * Actual solution is at the top
 *
 * @author tarek
 */
public class Main {
    public static void main(String[] args) {
        InputStream inputStream = System.in;
        OutputStream outputStream = System.out;
        InputReader in = new InputReader(inputStream);
        OutputWriter out = new OutputWriter(outputStream);
        ACAPSLOCK solver = new ACAPSLOCK();
        solver.solve(1, in, out);
        out.close();
    }

    static class ACAPSLOCK {
        public void solve(int testNumber, InputReader in, OutputWriter out) {
            String s = in.next();
            boolean p = true;
            String k = "";
            boolean f = true;
            String l = "";
            if (Character.isUpperCase(s.charAt(0)) == true) {
                for (int i = 1; i < s.length(); i++) {
                    if ((Character.isUpperCase(s.charAt(i)) == true)) {
                        p = true;
                    } else {
                        p = false;
                        break;
                    }
                }
                if (p == true) {
                    for (int i = 1; i < s.length(); i++) {
                        if (Character.isUpperCase(s.charAt(i)) == true) {
                            k += Character.toLowerCase(s.charAt(i));
                        } else {
                            k += Character.toUpperCase(s.charAt(i));
                        }
                    }
                    out.println(Character.toLowerCase(s.charAt(0)) + k);
                } else if (p == false) {
                    out.println(s);
                }

            } else if (Character.isLowerCase(s.charAt(0)) == true) {
                for (int i = 1; i < s.length(); i++) {
                    if (Character.isUpperCase(s.charAt(i)) == true) {
                        p = true;
                    } else {
                        p = false;
                        break;
                    }
                }
                if (p == true) {
                    for (int i = 1; i < s.length(); i++) {
                        if (Character.isUpperCase(s.charAt(i)) == true) {
                            l += Character.toLowerCase(s.charAt(i));
                        }
                    }
                    out.println(Character.toUpperCase(s.charAt(0)) + l);
                } else {
                    out.println(s);
                }


            }
        }

    }

    static class InputReader {
        private InputStream stream;
        private byte[] buf = new byte[1024];
        private int curChar;
        private int numChars;
        private InputReader.SpaceCharFilter filter;

        public InputReader(InputStream stream) {
            this.stream = stream;
        }

        public int read() {
            if (numChars == -1) {
                throw new InputMismatchException();
            }
            if (curChar >= numChars) {
                curChar = 0;
                try {
                    numChars = stream.read(buf);
                } catch (IOException e) {
                    throw new InputMismatchException();
                }
                if (numChars <= 0) {
                    return -1;
                }
            }
            return buf[curChar++];
        }

        public String nextString() {
            int c = read();
            while (isSpaceChar(c)) {
                c = read();
            }
            StringBuilder res = new StringBuilder();
            do {
                if (Character.isValidCodePoint(c)) {
                    res.appendCodePoint(c);
                }
                c = read();
            } while (!isSpaceChar(c));
            return res.toString();
        }

        public boolean isSpaceChar(int c) {
            if (filter != null) {
                return filter.isSpaceChar(c);
            }
            return isWhitespace(c);
        }

        public static boolean isWhitespace(int c) {
            return c == ' ' || c == '\n' || c == '\r' || c == '\t' || c == -1;
        }

        public String next() {
            return nextString();
        }

        public interface SpaceCharFilter {
            public boolean isSpaceChar(int ch);

        }

    }

    static class OutputWriter {
        private final PrintWriter writer;

        public OutputWriter(OutputStream outputStream) {
            writer = new PrintWriter(new BufferedWriter(new OutputStreamWriter(outputStream)));
        }

        public OutputWriter(Writer writer) {
            this.writer = new PrintWriter(writer);
        }

        public void print(Object... objects) {
            for (int i = 0; i < objects.length; i++) {
                if (i != 0) {
                    writer.print(' ');
                }
                writer.print(objects[i]);
            }
        }

        public void println(Object... objects) {
            print(objects);
            writer.println();
        }

        public void close() {
            writer.close();
        }

    }
}

