Task04Main.java

package com.example.task04;

import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.util.Comparator;
import java.util.Map;
import java.util.function.ToLongFunction;
import java.util.stream.Collectors;
import java.util.stream.Stream;

public class Task04Main {

    public static void main(String[] args) {

        BufferedReader reader = new BufferedReader( new InputStreamReader(System.in));

        reader.lines()
                .map(String::toLowerCase)
                .flatMap(x -> Stream.of(x.split("[^a-zа-яё0-9]")))
                .filter(x -> !x.isEmpty())
                .collect(Collectors.groupingBy(x -> x, Collectors.counting()))
                .entrySet()
                .stream()
                .sorted(Comparator.comparingLong((ToLongFunction<Map.Entry<String,Long>>) Map.Entry::getValue)
                        .reversed()
                        .thenComparing(Map.Entry::getKey))
                .limit(10)
                .forEach(t -> System.out.print(t.getKey() + "\n"));

    }

}