import java.util.Scanner;
import java.util.ArrayList;
public class makingAnagrams {

	public static void main(String[] args) {

		Scanner sc=new Scanner(System.in);

		String s1 = sc.next();
		String s2 = sc.next();

		ArrayList<Character> arr1 = new ArrayList<Character>();
		for(int i=0;i<s1.length();++i){
			arr1.add(s1.charAt(i));
		}

		ArrayList<Character> arr2 = new ArrayList<Character>();
		for(int i=0;i<s2.length();++i){
			arr2.add(s2.charAt(i));
		}


		int c=0, i=0;

		while(i!=arr1.size()){
			if(arr2.contains(arr1.get(i))){
				arr2.remove(arr2.indexOf(arr1.get(i)));
				arr1.remove(i);
			}
			else{
				++i;
			}
		}

		System.out.println(arr1.size()+arr2.size());
	}
}