import java.util.*;class Main{public static void main(String[] a){Scanner c=new Scanner(System.in);String s=c.next();String t=c.next();int b=0;for(int i=0;i<s.length();i++){if(s.charAt(i)!=t.charAt(i))b++;}System.out.println(b);}} import java.util.*; util.* java class Main{public static void main(String[] a){Scanner c=new Scanner(System.in);String s=c.next();String t=c.next();int b=0;for(int i=0;i<s.length();i++){if(s.charAt(i)!=t.charAt(i))b++;}System.out.println(b);}} Main public static void main(String[] a){Scanner c=new Scanner(System.in);String s=c.next();String t=c.next();int b=0;for(int i=0;i<s.length();i++){if(s.charAt(i)!=t.charAt(i))b++;}System.out.println(b);} main {Scanner c=new Scanner(System.in);String s=c.next();String t=c.next();int b=0;for(int i=0;i<s.length();i++){if(s.charAt(i)!=t.charAt(i))b++;}System.out.println(b);} Scanner c=new Scanner(System.in); c new Scanner(System.in) String s=c.next(); s c.next() c.next c String t=c.next(); t c.next() c.next c int b=0; b 0 for(int i=0;i<s.length();i++){if(s.charAt(i)!=t.charAt(i))b++;} int i=0; int i=0; i 0 i<s.length() i s.length() s.length s i++ i++ i {if(s.charAt(i)!=t.charAt(i))b++;} {if(s.charAt(i)!=t.charAt(i))b++;} if(s.charAt(i)!=t.charAt(i))b++; s.charAt(i)!=t.charAt(i) s.charAt(i) s.charAt s i t.charAt(i) t.charAt t i b++ b System.out.println(b) System.out.println System.out System System.out b String[] a a
import java.util.*;class Main{public static void main(String[] a){Scanner c=new Scanner(System.in);String s=c.next();String t=c.next();int b=0;for(int i=0;i<s.length();i++){if(s.charAt(i)!=t.charAt(i))b++;}System.out.println(b);}}