The output looks correct but the verification fails at output to the screen.
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());
}
// write your code here
Map<Character, Integer> hist = new HashMap<Character, Integer>();
for(Character letter : alphabet) {
hist.put(letter, 0);
}
for(String word : list) {
char[] w = word.toCharArray();
for(char ltr : w) {
int num = hist.get(ltr) + 1;
System.out.println(ltr + " " + num);
hist.put(ltr, num);
}
}
for(char x : alphabet) {
System.out.println(x + " " + hist.get(x));
}
}
}