What is wrong?
package pl.codegym.task.task10.task1012;
import jdk.nashorn.internal.runtime.WithObject;
import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.util.*;
/*
Liczba liter
*/
public class Solution {
public static void main(String[] args) throws Exception {
BufferedReader reader = new BufferedReader(new InputStreamReader(System.in));
// Alfabet
String abc = "aąbcćdeęfghijklłmnńoóprsśtuwyzźż";
char[] abcTablica = abc.toCharArray();
ArrayList<Character> alfabet = new ArrayList<>();
for (char litera : abcTablica) {
alfabet.add(litera);
}
// Czyta ciągi
ArrayList<String> lista = new ArrayList<>();
for (int i = 0; i < 10; i++) {
String s = reader.readLine();
lista.add(s.toLowerCase());
}
TreeMap<Character, Integer> map = new TreeMap<>();
alfabet.forEach( x -> map.merge(x, 0, Integer::sum));
for (String s : lista) {
char[] chars = s.toCharArray();
ArrayList<Character> word = new ArrayList<>();
for (char litera : chars) {
word.add(litera);
}
word.forEach(x -> map.merge(x, 1, Integer::sum));
}
for (Map.Entry<Character, Integer> x: map.entrySet()) {
System.out.println(x.getKey() + " " + x.getValue());
}
}
}