import java.io.BufferedReader;
import java.io.InputStreamReader;

public class No163 {
    public static void main(String[] args) {
        try {
            BufferedReader br = new BufferedReader(new InputStreamReader(
                    System.in));
            String S = br.readLine();
            char[] SCharArray = S.toCharArray();

            for (int i = 0; i < SCharArray.length; i++) {
                if ('a' <= SCharArray[i] && SCharArray[i] <= 'z') {
                    System.out.print((char) (SCharArray[i] - 32));
                } else {
                    System.out.print((char) (SCharArray[i] + 32));
                }
            }
            System.out.println();

        } catch (Exception e) {
            System.err.println("Error:" + e.getMessage());
        }
    }

}