백준 2744 java

import java.util.Scanner;

public class Bj2744 {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);

        String answer ="";
        String str;
        str = sc.nextLine();

        for(int i = 0; i < str.length(); i++)
        {
            if(str.charAt(i) >= 'A' && str.charAt(i) <= 'Z')
            {
                answer += (char)(str.charAt(i) + 32);
            }
            else
            {
                answer += (char)(str.charAt(i) - 32);
            }
        }
        System.out.println(answer);

        sc.close();
    }
}