kjasbdka.java

import java.util.*;
import java.util.ArrayList;
import java.util.Scanner;

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

		System.out.print("Enter input string: ");
		String inputString = input.next();

		System.out.print("Enter flag character: ");
		String flagCharacter = input.next();

		Boolean validInput = false;

		for (int i = 0; i < inputString.length(); i++) {
			if (Character.isUpperCase(inputString.charAt(i))) {
				validInput = true;
			} else {
				System.out.print("Bad input.");
			}

		}
		
		for (int i = 0; i < flagCharacter.length(); i++)
		{
			if (flagCharacter.charAt(i) == '$' || flagCharacter.charAt(i) == '#' || flagCharacter.charAt(i) == '*' || flagCharacter.charAt(i) == '&')
			{
				continue;
			}
			
			else {System.out.print("BAD INPUT BRUH");}
		}

		char repeatedLetter = inputString.charAt(0);

		if (validInput) {
			int counter = 0;
			for (int i = 0; i < inputString.length(); i++) {

				if (repeatedLetter == (inputString.charAt(i))) {
					counter++;
					repeatedLetter = inputString.charAt(i);
				} else {
					if (counter > 3) {
						System.out.print(flagCharacter + repeatedLetter + counter);
					} else {
						for (int j = counter; j > 0; j--) {
							System.out.print(repeatedLetter);
						}

					}
					repeatedLetter = inputString.charAt(i);
					counter = 1;
				}
			}
			if (counter > 3) {
				System.out.print(flagCharacter + repeatedLetter + counter);
			} else {
				for (int j = counter; j > 0; j--) {
					System.out.print(repeatedLetter);
				}
			}
		}
	}

}