input String S, output the length of String S 			String s = sc.nextLine();
		System.out.println(s.length());
			input String A. output YES if A equals to "Happy"			String a = sc.nextLine();
		if(a.equals("Happy")){System.out.println("yes");}
			input String B, output the amount of letter "A" inside String B using for loop
			int e = 0;
		String f = sc.nextLine();
			for(int i=0; i<f.length(); i++){
				if(f.equals("A")){e++;}
		}System.out.println(e);
			input String C, output the amount of "7" inside String C using replace
		String C = sc.nextLine();
		String c2 = C.replaceAll("7", "");
			System.out.println(C.length()-c2.length());

		Using for loop to output "===" 100 times
		for(int i=0; i<100; i++){
				System.out.println("===");
			}
		Using for loop to output "++" 5 times
			for(int i=0; i<5; i++){
			System.out.println("++");
				}
			Using for loop to output "HI" 11 times
		for(int i=0; i<11; i++){
			System.out.println("HI");
				}
			Using for loop to output "Yummy" 10 times
		for(int i=0; i<10; i++){
				System.out.println("Yummy");
			}
			Using for loop to output "Bruce" 23 times
			for(int i=0; i<23; i++){
				System.out.println("Bruce");
				}
			Using for loop to output 0 5 10 15 20 25 30
		for(int i=0; i<35; i+=5){
				System.out.println(i);
			}
			Using for loop to output 1 2 3 4 5
		for(int i=1; i<6; i++){
				System.out.println(i);
				}
			input String S
			Using for loop to output char one by one from String S forward
			Using for loop to output char one by one backward
            String w = sc.nextLine();
            for(int i=0; i<w.length(); i++){
            	System.out.print(w.charAt(i));
            }System.out.println();
            for(int i=w.length()-1; i>=0; i--){
            	System.out.print(w.charAt(i));
            }
			A is 1 3 5 7
		B is 2 4 6 8
			Using nested for loop to output A and B's combination
            int[] AA = {1, 3, 5, 7};
            int[] Ab = {2, 4, 6, 8};
		    for(int i=0; i<16; i++){
		    	System.out.println(AA[i]+"       "+Ab[i]);
		    }



		}



		}