
import java.util.*;
 public class Main {
    public static void main(String[] args) {
        Scanner sc = new  Scanner(System.in);
      String s = sc.next();
      String t = sc.next();
      int count =0;
      for(int i=0;i<s.length();i++){
         outer: for(int j =i;j<s.length();j++){
              if(s.charAt(i)!=t.charAt(j)){
                  count++;
               break outer;
              }else{
                  break outer;
              }
          }
      }
      System.out.println(count);
        
    


}

    }
     import java.util.*; util.* java public class Main {
    public static void main(String[] args) {
        Scanner sc = new  Scanner(System.in);
      String s = sc.next();
      String t = sc.next();
      int count =0;
      for(int i=0;i<s.length();i++){
         outer: for(int j =i;j<s.length();j++){
              if(s.charAt(i)!=t.charAt(j)){
                  count++;
               break outer;
              }else{
                  break outer;
              }
          }
      }
      System.out.println(count);
        
    


}

    } Main public static void main(String[] args) {
        Scanner sc = new  Scanner(System.in);
      String s = sc.next();
      String t = sc.next();
      int count =0;
      for(int i=0;i<s.length();i++){
         outer: for(int j =i;j<s.length();j++){
              if(s.charAt(i)!=t.charAt(j)){
                  count++;
               break outer;
              }else{
                  break outer;
              }
          }
      }
      System.out.println(count);
        
    


} main {
        Scanner sc = new  Scanner(System.in);
      String s = sc.next();
      String t = sc.next();
      int count =0;
      for(int i=0;i<s.length();i++){
         outer: for(int j =i;j<s.length();j++){
              if(s.charAt(i)!=t.charAt(j)){
                  count++;
               break outer;
              }else{
                  break outer;
              }
          }
      }
      System.out.println(count);
        
    


} Scanner sc = new  Scanner(System.in); sc new  Scanner(System.in) String s = sc.next(); s sc.next() sc.next sc String t = sc.next(); t sc.next() sc.next sc int count =0; count 0 for(int i=0;i<s.length();i++){
         outer: for(int j =i;j<s.length();j++){
              if(s.charAt(i)!=t.charAt(j)){
                  count++;
               break outer;
              }else{
                  break outer;
              }
          }
      } int i=0; int i=0; i 0 i<s.length() i s.length() s.length s i++ i++ i {
         outer: for(int j =i;j<s.length();j++){
              if(s.charAt(i)!=t.charAt(j)){
                  count++;
               break outer;
              }else{
                  break outer;
              }
          }
      } {
         outer: for(int j =i;j<s.length();j++){
              if(s.charAt(i)!=t.charAt(j)){
                  count++;
               break outer;
              }else{
                  break outer;
              }
          }
      } System.out.println(count) System.out.println System.out System System.out count String[] args args public class Main {
    public static void main(String[] args) {
        Scanner sc = new  Scanner(System.in);
      String s = sc.next();
      String t = sc.next();
      int count =0;
      for(int i=0;i<s.length();i++){
         outer: for(int j =i;j<s.length();j++){
              if(s.charAt(i)!=t.charAt(j)){
                  count++;
               break outer;
              }else{
                  break outer;
              }
          }
      }
      System.out.println(count);
        
    


}

    } public class Main {
    public static void main(String[] args) {
        Scanner sc = new  Scanner(System.in);
      String s = sc.next();
      String t = sc.next();
      int count =0;
      for(int i=0;i<s.length();i++){
         outer: for(int j =i;j<s.length();j++){
              if(s.charAt(i)!=t.charAt(j)){
                  count++;
               break outer;
              }else{
                  break outer;
              }
          }
      }
      System.out.println(count);
        
    


}

    } Main

import java.util.*;
 public class Main {
    public static void main(String[] args) {
        Scanner sc = new  Scanner(System.in);
      String s = sc.next();
      String t = sc.next();
      int count =0;
      for(int i=0;i<s.length();i++){
         outer: for(int j =i;j<s.length();j++){
              if(s.charAt(i)!=t.charAt(j)){
                  count++;
               break outer;
              }else{
                  break outer;
              }
          }
      }
      System.out.println(count);
        
    


}

    }
    
