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.util.*;
import java.io.*;
import java.math.*;

public class A131A {

    /**
     * @param args
     */
    public static final boolean DEBUG = true;

    public static void main(String[] args) {
        try {
            FastInput fastInput = new FastInput(System.in);
            FastOutput fastOutput = new FastOutput(System.out);
            A131A a131A = new A131A();
            // int tc = fastInput.readInt();
            int tc = 1;
            while (tc-- > 0) {
                a131A.solve(fastInput, fastOutput);
            }
            fastOutput.close();
        } catch (Exception exception) {
            exception.printStackTrace();
        }
    }

    public void solve(FastInput fastInput, FastOutput fastOutput)
            throws Exception {
        String msg = "";
        int len;
        boolean isValid = false;
        msg = fastInput.readString();
        len = msg.length();
        if (DEBUG) {
            assertThat(1 <= len && len <= 100);
        }
        for (int i = 1; i < len; i++) {
            if (msg.charAt(i) >= 97) {
                isValid = true;
                break;
            }
        }
        if (!isValid) {
            fastOutput.print(msg.charAt(0) >= 97 ? ""
                    + (char) (msg.charAt(0) - 32) : ""
                    + (char) (msg.charAt(0) + 32));
        }
        fastOutput.printLine(isValid ? msg : msg.substring(1).toLowerCase());

    }

    public static void assertThat(boolean assertion) {
        if (!assertion) {
            throw new ArithmeticException();
        }
    }
}

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

    public FastInput(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 int readInt() {
        int c = read();
        while (isSpaceChar(c))
            c = read();
        int sgn = 1;
        if (c == '-') {
            sgn = -1;
            c = read();
        }
        int res = 0;
        do {
            if (c < '0' || c > '9')
                throw new InputMismatchException();
            res *= 10;
            res += c - '0';
            c = read();
        } while (!isSpaceChar(c));
        return res * sgn;
    }

    public long readLong() {
        int c = read();
        while (isSpaceChar(c))
            c = read();
        int sgn = 1;
        if (c == '-') {
            sgn = -1;
            c = read();
        }
        long res = 0;
        do {
            if (c < '0' || c > '9')
                throw new InputMismatchException();
            res *= 10;
            res += c - '0';
            c = read();
        } while (!isSpaceChar(c));
        return res * sgn;
    }

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

    public boolean isSpaceChar(int c) {
        if (filter != null)
            return filter.isSpaceChar(c);
        return c == ' ' || c == '\n' || c == '\r' || c == '\t' || c == -1;
    }

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

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

class FastOutput {
    private final PrintWriter writer;

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

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

    public FastOutput(File outputStream) throws Exception {
        this.writer = new PrintWriter(outputStream);
    }

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

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

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