CounterLetter

CounterLetter.java

import java.util.HashMap;
import java.util.Scanner;

public class CounterLetter {

    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        
        String word = sc.nextLine();
        HashMap<Character, Integer> counter = new HashMap<>();

        // количество букв в слове
        for (int i = 0; i < word.length(); i++) {
            char letter = word.charAt(i);
            counter.put(letter, counter.getOrDefault(letter, 0) + 1);
        }

        // больше трех раз
        for (char letter : counter.keySet()) {
            int count = counter.get(letter);
            if (count >= 3) {
                System.out.println("В слове " + word + " " + count + " букв(a) " + letter);
                break;
            }
            System.out.println(letter + ": " + count);
        }
        
        sc.close();
    }
}