public static void main ( String [ ] $ ) {
  int a = scanner . nextInt ( ) , b = scanner . nextInt ( ) ;
  System . out . println ( Math . max ( Math . max ( a - b + Math . max ( 9 - a / 100 , b / 100 - 1 ) * 100 , a - b + Math . max ( 9 - a % 100 / 10 , b % 100 / 10 ) * 10 ) , a - b + Math . max ( 9 - a % 10 , b % 10 ) ) ) ;
}

public static void main ( String [ ] $ ) { int a = scanner . nextInt ( ) , b = scanner . nextInt ( ) ; System . out . println ( Math . max ( Math . max ( a - b + Math . max ( 9 - a / 100 , b / 100 - 1 ) * 100 , a - b + Math . max ( 9 - a % 100 / 10 , b % 100 / 10 ) * 10 ) , a - b + Math . max ( 9 - a % 10 , b % 10 ) ) ) ; }
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