import java.util.HashMap;
import java.util.HashSet;
import java.util.concurrent.atomic.AtomicReference;

public class GetNumbersFromWord
{
    @SuppressWarnings("serial")
    private static final HashMap<Integer, HashMap<Character, Integer>> allTheNumbers = new HashMap<Integer, HashMap<Character, Integer>>()
    {{
        put(0, new HashMap<Character, Integer>(){{ put('Z', 1); put('E', 1); put('R', 1); put('O', 1); }});
        put(1, new HashMap<Character, Integer>(){{ put('O', 1); put('N', 1); put('E', 1); }});
        put(2, new HashMap<Character, Integer>(){{ put('T', 1); put('W', 1); put('O', 1); }});
        put(3, new HashMap<Character, Integer>(){{ put('T', 1); put('H', 1); put('R', 1); put('E', 2); }});
        put(4, new HashMap<Character, Integer>(){{ put('F', 1); put('O', 1); put('U', 1); put('R', 1); }});
        put(5, new HashMap<Character, Integer>(){{ put('F', 1); put('I', 1); put('V', 1); put('E', 1); }});
        put(6, new HashMap<Character, Integer>(){{ put('S', 1); put('I', 1); put('X', 1); }});
        put(7, new HashMap<Character, Integer>(){{ put('S', 1); put('E', 2); put('V', 1); put('N', 1); }});
        put(8, new HashMap<Character, Integer>(){{ put('E', 1); put('I', 1); put('G', 1); put('H', 1); put('T', 1); }});
        put(9, new HashMap<Character, Integer>(){{ put('N', 2); put('I', 1); put('E', 1); }});
    }};

    public static void main(final String[] args)
    {
        DoTheThing("nitwnoe");
    }

    private static void DoTheThing(final String s)
    {
        final HashMap<Character, Integer> stringCharCount = new HashMap<>();
        for (final char c : s.toUpperCase().toCharArray()) {
            Integer count = stringCharCount.get(c);
            if (count == null) count = 0;
            stringCharCount.put(c, ++count);
        }

        final HashSet<Integer> numbersInString = new HashSet<Integer>();

        allTheNumbers.forEach((i, numCharCounts) -> {

            final AtomicReference<Boolean> isNumberInString = new AtomicReference<>(true);

            numCharCounts.forEach((c, count) -> {
                if (!stringCharCount.containsKey(c) || stringCharCount.get(c) < count) {
                    isNumberInString.set(false);
                }
            });

            if (isNumberInString.get())
            {
                numbersInString.add(i);
            }
        });

        System.out.println("numbersInString: " + numbersInString);
    }
}