Java implementation of the problem!!

import java.io.*;

import java.util.*;

import java.text.*;

import java.math.*;

import java.util.regex.*;

public class Solution {

public static void main(String[] args) {
    /* Enter your code here. Read input from STDIN. Print output to STDOUT. Your class should be named Solution. */
    Scanner sc=new Scanner(System.in);
    String s1=sc.nextLine();
    String s2=sc.nextLine();
    int cArr[]=new int[26];
    int cArr1[]=new int[26];
    for(int i=0;i<s1.length();i++)cArr[s1.charAt(i)-97]++;
    for(int i=0;i<s2.length();i++)cArr1[s2.charAt(i)-97]++;
    int count=0;
    for(int i=0;i<26;i++)count+=Math.abs(cArr[i]-cArr1[i]);
    System.out.println(count);
}

}