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) {
    String[] firstarray = first.split("");
        String[] secondarray = second.split("");
        int final_res = 0;


        for(int cnt1 = 0; cnt1< firstarray.length; cnt1++){
            boolean flag = false;
            int cnt2 = secondarray.length;
            int counter = 0;
            while(flag == false && counter<cnt2){
                if (firstarray[cnt1].contains(secondarray[counter]))
                    flag = true;
                counter++;

            }
            if(flag == false)
                final_res++;
        }


           for(int cnt4 = 0; cnt4< secondarray.length; cnt4++){
            boolean flag1 = false;
            int cnt3 = firstarray.length;
            int counter1 = 0;
            while(flag1 == false && counter1<cnt3){
                if (secondarray[cnt4].contains(firstarray[counter1]))
                    flag1 = true;
                counter1++;
            }
            if(flag1 == false)
                final_res++;
        }


            return final_res;

    }

    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));
    }
}