3 and 4 didn't pass.
package com.codegym.task.task10.task1012;
import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.Map;
/*
Number of letters
*/
public class Solution {
public static void main(String[] args) throws Exception {
BufferedReader reader = new BufferedReader(new InputStreamReader(System.in));
// Alphabet
String abc = "abcdefghijklmnopqrstuvwxyz";
char[] abcArray = abc.toCharArray();
ArrayList<Character> alphabet = new ArrayList<>();
for (char letter : abcArray) {
alphabet.add(letter);
}
// Read in strings
ArrayList<String> list = new ArrayList<>();
for (int i = 0; i < 10; i++) {
String s = reader.readLine();
list.add(s.toLowerCase());
}
ArrayList<Character> listaChar = new ArrayList<>();
for (String str : list) {
for (char car : str.toCharArray()) {
listaChar.add(car);
}
}
HashMap<Character, Integer> contadores = new HashMap<>();
for (char caracter : alphabet) {
contadores.put(caracter, 0);
}
for (char car : listaChar) {
if (contadores.containsKey(car)) {
contadores.put(car, contadores.get(car) + 1);
} else {
contadores.put(car, 0);
}
}
for (Map.Entry<Character, Integer> entry : contadores.entrySet()) {
System.out.println(entry.getKey() + " " + entry.getValue());
}
}
}