public static void main ( String args [ ] ) {
  Scanner sc = new Scanner ( System . in ) ;
  long p = sc . nextLong ( ) ;
  long d = sc . nextLong ( ) ;
  String s = Long . toString ( p ) ;
  long temp ;
  for ( int i = s . length ( ) - 1 ;
  i >= 0 ;
  i -- ) {
    s = Long . toString ( p ) ;
    if ( s . charAt ( i ) != '9' ) {
      temp = ( long ) Math . pow ( 10 , s . length ( ) - i - 1 ) * ( Long . parseLong ( "" + s . charAt ( i ) ) + 1 ) ;
      if ( d >= temp ) {
        d -= temp ;
        p -= temp ;
      }
    }
  }
  System . out . println ( p ) ;
}

public static void main ( String args [ ] ) { Scanner sc = new Scanner ( System . in ) ; long p = sc . nextLong ( ) ; long d = sc . nextLong ( ) ; String s = Long . toString ( p ) ; long temp ; for ( int i = s . length ( ) - 1 ; i >= 0 ; i -- ) { s = Long . toString ( p ) ; if ( s . charAt ( i ) != '9' ) { temp = ( long ) Math . pow ( 10 , s . length ( ) - i - 1 ) * ( Long . parseLong ( " " + s . charAt ( i ) ) + 1 ) ; if ( d >= temp ) { d -= temp ; p -= temp ; } } } System . out . println ( p ) ; }
(method_declaration (modifiers) type: (void_type) name: (identifier) parameters: (formal_parameters (formal_parameter type: (type_identifier) name: (identifier) dimensions: (dimensions))) body: (block (local_variable_declaration type: (type_identifier) declarator: (variable_declarator name: (identifier) value: (object_creation_expression type: (type_identifier) arguments: (argument_list (field_access object: (identifier) field: (identifier)))))) (local_variable_declaration type: (integral_type) declarator: (variable_declarator name: (identifier) value: (method_invocation object: (identifier) name: (identifier) arguments: (argument_list)))) (local_variable_declaration type: (integral_type) declarator: (variable_declarator name: (identifier) value: (method_invocation object: (identifier) name: (identifier) arguments: (argument_list)))) (local_variable_declaration type: (type_identifier) declarator: (variable_declarator name: (identifier) value: (method_invocation object: (identifier) name: (identifier) arguments: (argument_list (identifier))))) (local_variable_declaration type: (integral_type) declarator: (variable_declarator name: (identifier))) (for_statement init: (local_variable_declaration type: (integral_type) declarator: (variable_declarator name: (identifier) value: (binary_expression left: (method_invocation object: (identifier) name: (identifier) arguments: (argument_list)) right: (decimal_integer_literal)))) condition: (binary_expression left: (identifier) right: (decimal_integer_literal)) update: (update_expression (identifier)) body: (block (expression_statement (assignment_expression left: (identifier) right: (method_invocation object: (identifier) name: (identifier) arguments: (argument_list (identifier))))) (if_statement condition: (parenthesized_expression (binary_expression left: (method_invocation object: (identifier) name: (identifier) arguments: (argument_list (identifier))) right: (character_literal))) consequence: (block (expression_statement (assignment_expression left: (identifier) right: (binary_expression left: (cast_expression type: (integral_type) value: (method_invocation object: (identifier) name: (identifier) arguments: (argument_list (decimal_integer_literal) (binary_expression left: (binary_expression left: (method_invocation object: (identifier) name: (identifier) arguments: (argument_list)) right: (identifier)) right: (decimal_integer_literal))))) right: (parenthesized_expression (binary_expression left: (method_invocation object: (identifier) name: (identifier) arguments: (argument_list (binary_expression left: (string_literal) right: (method_invocation object: (identifier) name: (identifier) arguments: (argument_list (identifier)))))) right: (decimal_integer_literal)))))) (if_statement condition: (parenthesized_expression (binary_expression left: (identifier) right: (identifier))) consequence: (block (expression_statement (assignment_expression left: (identifier) right: (identifier))) (expression_statement (assignment_expression left: (identifier) right: (identifier))))))))) (expression_statement (method_invocation object: (field_access object: (identifier) field: (identifier)) name: (identifier) arguments: (argument_list (identifier))))))