package test;

import java.util.*;

class Main {
    public static void main(String[] args) {

        Scanner scanner = new Scanner(System.in);

        Map<Character, Integer> entriesOfFirstWordChar = getEntriesMap(scanner.nextLine().toLowerCase());
        Map<Character, Integer> entriesOfSecondWordChar = getEntriesMap(scanner.nextLine().toLowerCase());

        System.out.println(getCountOfCharsForDelete(entriesOfFirstWordChar,entriesOfSecondWordChar));

    }

    private static int getCountOfCharsForDelete(Map<Character, Integer> entriesOfFirstWordChar, Map<Character, Integer> entriesOfSecondWordChar) {

        int count = 0;

        Set<Character> characterSet = new HashSet<>();
        characterSet.addAll(entriesOfFirstWordChar.keySet());
        characterSet.addAll(entriesOfSecondWordChar.keySet());

        for (char currentChar:
            characterSet) {

            count += Math.abs(
                    entriesOfFirstWordChar.getOrDefault(currentChar,0)
                    -entriesOfSecondWordChar.getOrDefault(currentChar,0)
            );

        }

        return count;

    }

    private static Map<Character, Integer> getEntriesMap(String firstWord) {

        char[] charset = firstWord.toCharArray();

        Map<Character, Integer> entries = new HashMap<>();

        for (int i = 0; i < charset.length; i++) {

            char currentChar = charset[i];

            entries.put(currentChar,
                    entries.getOrDefault(currentChar, 0) + 1);

        }

        return entries;

    }
}