Strings.java

import java.util.Scanner;

public class Strings {
    public static void main(String args[]){
        Scanner sc = new Scanner(System.in);
        String s = "\tabc def     " ;
        // System.out.println(s.charAt(2));  //Indexing
        // System.out.println(s.length());  //lenght of string

        // System.out.println(s.substring(2,s.length()));  //Substring Function
        // System.out.println(s);
        // System.out.println(s.trim());
        // System.out.println(s.contains("abc"));

        // String c = "How are you";
       
        // System.out.println(c.substring(3).indexOf('a'));
        // System.out.println(c.indexOf('o'));
        // System.out.println(c.lastIndexOf('o'));
        char h = sc.next().charAt(0);
        if(Character.isUpperCase(h))
        System.out.println(Character.toLowerCase(h));
        else
        System.out.println(Character.toUpperCase(h));






        // int n = 97;//A=65.a=97.'0'=48
        // char c = (char)n;
        // System.out.println('a' + "b" +'c');
    }
}