import java.util.Scanner;
 
class Main {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        StringBuilder text = new StringBuilder();
 
        while (sc.hasNextLine()) {
            text.append(sc.nextLine()).append("\n");
        }
        sc.close();
 
        String str = text.toString();
        String target = "hello world";
        int count = 0;
        int index = 0;
 
        while ((index = str.indexOf(target, index)) != -1) {
            count++;
            index += target.length();
        }
 
        System.out.println(count);
    }
}
 

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

During my journey as a programmer, I started with the classic phrase HELLO WORLD.
Some people write it as Hello world, others as hello WORLD or even HeLLo WoRlD!
I once saw someone type hello  world with weird spacing or hello-world with a dash.
Another wrote: "hello, world" with a comma. My friend wrote it in a sentence like: When I wake up I say hello world before breakfast. But not everything is a greeting—sometimes it's in code: System.out.println("HELLO WORLD"); or commented like // hello world.
Even hidden inside text like aHELLO WORLDb or ending a paragraph with hello world...