import java.util.Scanner;

public class Main{
	public static void main(String[] args){
		try(Scanner sc = new Scanner(System.in)){
			String line = sc.nextLine();
			String answer = "";
			int length = line.length();
			for(int i = 0; i < length; i++){
				char ch = line.charAt(i);
				if(Character.isUpperCase(ch)){
					ch = Character.toLowerCase(ch);
					System.out.print(ch);
				}else if(Character.isLowerCase(ch)){
					ch = Character.toUpperCase(ch);
					System.out.print(ch);
				}else{
					System.out.print(ch);
				}
			}
			System.out.println();
		}
	}
} import java.util.Scanner; Scanner java.util public class Main{
	public static void main(String[] args){
		try(Scanner sc = new Scanner(System.in)){
			String line = sc.nextLine();
			String answer = "";
			int length = line.length();
			for(int i = 0; i < length; i++){
				char ch = line.charAt(i);
				if(Character.isUpperCase(ch)){
					ch = Character.toLowerCase(ch);
					System.out.print(ch);
				}else if(Character.isLowerCase(ch)){
					ch = Character.toUpperCase(ch);
					System.out.print(ch);
				}else{
					System.out.print(ch);
				}
			}
			System.out.println();
		}
	}
} Main public static void main(String[] args){
		try(Scanner sc = new Scanner(System.in)){
			String line = sc.nextLine();
			String answer = "";
			int length = line.length();
			for(int i = 0; i < length; i++){
				char ch = line.charAt(i);
				if(Character.isUpperCase(ch)){
					ch = Character.toLowerCase(ch);
					System.out.print(ch);
				}else if(Character.isLowerCase(ch)){
					ch = Character.toUpperCase(ch);
					System.out.print(ch);
				}else{
					System.out.print(ch);
				}
			}
			System.out.println();
		}
	} main {
		try(Scanner sc = new Scanner(System.in)){
			String line = sc.nextLine();
			String answer = "";
			int length = line.length();
			for(int i = 0; i < length; i++){
				char ch = line.charAt(i);
				if(Character.isUpperCase(ch)){
					ch = Character.toLowerCase(ch);
					System.out.print(ch);
				}else if(Character.isLowerCase(ch)){
					ch = Character.toUpperCase(ch);
					System.out.print(ch);
				}else{
					System.out.print(ch);
				}
			}
			System.out.println();
		}
	} try(Scanner sc = new Scanner(System.in)){
			String line = sc.nextLine();
			String answer = "";
			int length = line.length();
			for(int i = 0; i < length; i++){
				char ch = line.charAt(i);
				if(Character.isUpperCase(ch)){
					ch = Character.toLowerCase(ch);
					System.out.print(ch);
				}else if(Character.isLowerCase(ch)){
					ch = Character.toUpperCase(ch);
					System.out.print(ch);
				}else{
					System.out.print(ch);
				}
			}
			System.out.println();
		} {
			String line = sc.nextLine();
			String answer = "";
			int length = line.length();
			for(int i = 0; i < length; i++){
				char ch = line.charAt(i);
				if(Character.isUpperCase(ch)){
					ch = Character.toLowerCase(ch);
					System.out.print(ch);
				}else if(Character.isLowerCase(ch)){
					ch = Character.toUpperCase(ch);
					System.out.print(ch);
				}else{
					System.out.print(ch);
				}
			}
			System.out.println();
		} Scanner sc = new Scanner(System.in) Scanner sc = new Scanner(System.in) new Scanner(System.in) String line = sc.nextLine(); line sc.nextLine() sc.nextLine sc String answer = ""; answer "" int length = line.length(); length line.length() line.length line for(int i = 0; i < length; i++){
				char ch = line.charAt(i);
				if(Character.isUpperCase(ch)){
					ch = Character.toLowerCase(ch);
					System.out.print(ch);
				}else if(Character.isLowerCase(ch)){
					ch = Character.toUpperCase(ch);
					System.out.print(ch);
				}else{
					System.out.print(ch);
				}
			} int i = 0; int i = 0; i 0 i < length i length i++ i++ i {
				char ch = line.charAt(i);
				if(Character.isUpperCase(ch)){
					ch = Character.toLowerCase(ch);
					System.out.print(ch);
				}else if(Character.isLowerCase(ch)){
					ch = Character.toUpperCase(ch);
					System.out.print(ch);
				}else{
					System.out.print(ch);
				}
			} {
				char ch = line.charAt(i);
				if(Character.isUpperCase(ch)){
					ch = Character.toLowerCase(ch);
					System.out.print(ch);
				}else if(Character.isLowerCase(ch)){
					ch = Character.toUpperCase(ch);
					System.out.print(ch);
				}else{
					System.out.print(ch);
				}
			} char ch = line.charAt(i); ch line.charAt(i) line.charAt line i if(Character.isUpperCase(ch)){
					ch = Character.toLowerCase(ch);
					System.out.print(ch);
				}else if(Character.isLowerCase(ch)){
					ch = Character.toUpperCase(ch);
					System.out.print(ch);
				}else{
					System.out.print(ch);
				} Character.isUpperCase(ch) Character.isUpperCase Character ch {
					ch = Character.toLowerCase(ch);
					System.out.print(ch);
				} ch = Character.toLowerCase(ch) ch Character.toLowerCase(ch) Character.toLowerCase Character ch System.out.print(ch) System.out.print System.out System System.out ch if(Character.isLowerCase(ch)){
					ch = Character.toUpperCase(ch);
					System.out.print(ch);
				}else{
					System.out.print(ch);
				} Character.isLowerCase(ch) Character.isLowerCase Character ch {
					ch = Character.toUpperCase(ch);
					System.out.print(ch);
				} ch = Character.toUpperCase(ch) ch Character.toUpperCase(ch) Character.toUpperCase Character ch System.out.print(ch) System.out.print System.out System System.out ch {
					System.out.print(ch);
				} System.out.print(ch) System.out.print System.out System System.out ch System.out.println() System.out.println System.out System System.out String[] args args public class Main{
	public static void main(String[] args){
		try(Scanner sc = new Scanner(System.in)){
			String line = sc.nextLine();
			String answer = "";
			int length = line.length();
			for(int i = 0; i < length; i++){
				char ch = line.charAt(i);
				if(Character.isUpperCase(ch)){
					ch = Character.toLowerCase(ch);
					System.out.print(ch);
				}else if(Character.isLowerCase(ch)){
					ch = Character.toUpperCase(ch);
					System.out.print(ch);
				}else{
					System.out.print(ch);
				}
			}
			System.out.println();
		}
	}
} public class Main{
	public static void main(String[] args){
		try(Scanner sc = new Scanner(System.in)){
			String line = sc.nextLine();
			String answer = "";
			int length = line.length();
			for(int i = 0; i < length; i++){
				char ch = line.charAt(i);
				if(Character.isUpperCase(ch)){
					ch = Character.toLowerCase(ch);
					System.out.print(ch);
				}else if(Character.isLowerCase(ch)){
					ch = Character.toUpperCase(ch);
					System.out.print(ch);
				}else{
					System.out.print(ch);
				}
			}
			System.out.println();
		}
	}
} Main
import java.util.Scanner;

public class Main{
	public static void main(String[] args){
		try(Scanner sc = new Scanner(System.in)){
			String line = sc.nextLine();
			String answer = "";
			int length = line.length();
			for(int i = 0; i < length; i++){
				char ch = line.charAt(i);
				if(Character.isUpperCase(ch)){
					ch = Character.toLowerCase(ch);
					System.out.print(ch);
				}else if(Character.isLowerCase(ch)){
					ch = Character.toUpperCase(ch);
					System.out.print(ch);
				}else{
					System.out.print(ch);
				}
			}
			System.out.println();
		}
	}
}
