/*

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*/

/**

*

* @author Dell

*/

import java.util.*;

import java.io.*;

public class Anagrams {

static public void check(String A, String B){

HashMap<Character,Integer> hs1 = new HashMap<Character,Integer>(26);

HashMap<Character,Integer> hs2 = new HashMap<Character,Integer>(26);

for(char c : A.toCharArray()){

if(hs1.containsKey(c) == true){

int value = hs1.get(c);

value = value + 1;

hs1.put(c, value);

}

else{

hs1.put(c,1);

}

}

for(char c :B.toCharArray()){

if(hs2.containsKey(c) == true){

int value1 = hs2.get(c);

value1 = value1 + 1;

hs2.put(c, value1);

}

else{

hs2.put(c,1);

}

}

int count = 0;

for(char c : hs1.keySet()){

int difference = 0;

if(hs2.containsKey(c)){

difference = Math.abs(hs2.get(c) - hs1.get(c));

count = count + difference;

hs2.remove(c);

}

else{

count = count + hs1.get(c);

}

}

for(char ch : hs2.keySet()){

count = count + hs2.get(ch);

}

// for(Map.Entry m : hs1.entrySet()){

//

// System.out.println(m.getKey() + " -> " + m.getValue() + "\n");

// }

//

// for(Map.Entry m2 : hs2.entrySet()){

//

// System.out.println(m2.getKey() + " -> " + m2.getValue() + "\n");

// }

System.out.println("Count is ::" + count);

}

public static void main(String[] args)throws Exception{

BufferedReader br = new BufferedReader(new InputStreamReader(System.in));

String a = br.readLine();

String b = br.readLine();

check(a,b);

}

}