import java.io.*;
       import java.util.*;
       import java.text.*;
       import java.math.*;
       import java.util.regex.*;
       public class Solution {
public static int numberNeeded(String first, String second) {
  char arr1[]=first.toCharArray();
    char arr2[]=second.toCharArray();
    ArrayList<Character>ar=new ArrayList<Character>();
    ArrayList<Character>ar1=new ArrayList<Character>();
    for(int i=0;i<first.length();i++)     //The code is running fine here
        {
        ar.add(arr1[i]);
    }
    for(int j=0;j<second.length();j++)  //Although here when I am following the same algo it is giving an ArrayIndexOut Of Bounds Exception
        {
        ar1.add(arr2[j]);
    }
    for(int k=0;k<first.length();k++)
        {char c=ar.get(k);
        for(int l=0;l<second.length();l++)
            {
            char d=ar1.get(l);
            if(c==d)
                {
                ar.remove(k);
                ar1.remove(l);
                break;
            }
        }
    }
    int size=ar.size()+ar1.size();
    return size;

}

public static void main(String[] args) {
    Scanner in = new Scanner(System.in);
    String a = in.next();
    String b = in.next();
    System.out.println(numberNeeded(a, b));
}
}