package baekjoon;
import java.io.*;
public class 애너그램만들기_1919 {
public static void main(String[] args) throws IOException {
BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
int[] arr1 = new int[26];
int[] arr2 = new int[26];
String str1 = br.readLine();
String str2 = br.readLine();
for(int i=0; i<str1.length(); i++)
arr1[str1.charAt(i)-'a']++;
for(int i=0; i<str2.length(); i++)
arr2[str2.charAt(i)-'a']++;
int cnt = 0;
for(int i=0; i<26; i++){
cnt += Math.abs(arr1[i]-arr2[i]);
}
System.out.println(cnt);
br.close();
}
}
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