Javarush Alfa

package com.javarush.task.task10.task1012;

import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.util.ArrayList;
import java.util.List;
import java.util.Arrays;

/*
Количество букв
*/

public class Solution {
    public static void main(String[] args) throws Exception {
        BufferedReader reader = new BufferedReader(new InputStreamReader(System.in));

        // Алфавит
        List<Character> alphabet = Arrays.asList(
                'а','б','в','г','д','е','ё','ж',
                'з','и','й','к','л','м','н','о',
                'п','р','с','т','у','ф','х','ц',
                'ч','ш','щ','ъ','ы','ь','э','ю','я');

        // Ввод строк
        ArrayList<String> list = new ArrayList<String>();
        for (int i = 0; i < 10; i++) {
            String s = reader.readLine();
            list.add(s.toLowerCase());
        }


        for (char ch : alphabet) {
            int counter = 0;
            for (String str: list) {
                for (Character subsstr : str.toCharArray()) {
                    if (subsstr == ch)
                        counter++;
                }
            }
            System.out.printf("%c %d\n", ch, counter);
        }

    }
}