import java.io.*;

// 処理
class Process {
    private String S;

    Process(String S) {
        this.S = S;
    }
    
    private boolean isLowerCase(char c) {
        return ((c >= 'a') && (c <= 'z'));
    }

    String getResult() {
        var result = new StringBuffer("");

        char c = 0;
        for(int i = 0; i < S.length(); i++) {
            c = S.charAt(i);
            result.append(isLowerCase(c) ? (char)(c - 32) : (char)(c + 32));
        }

        return result.toString();
    }
}

public class Main {
    public static void main(String[] args) throws IOException {
        var bufferedReader = new BufferedReader(new InputStreamReader(System.in));
        var printWriter    = new PrintWriter(new BufferedWriter(new OutputStreamWriter(System.out)));

        // 入力
        String S = bufferedReader.readLine().trim();

        // 出力
        printWriter.println((new Process(S)).getResult());

        bufferedReader.close();
        printWriter.close();
    }
}