public static void main ( String [ ] args ) {
  Scanner sc = new Scanner ( System . in ) ;
  String str = sc . nextLine ( ) ;
  int n = Integer . parseInt ( str . substring ( 0 , str . indexOf ( " " ) ) ) ;
  int k = Integer . parseInt ( str . substring ( str . indexOf ( " " ) + 1 , str . length ( ) ) ) ;
  for ( int i = 1 ;
  i <= k ;
  i ++ ) {
    if ( n % 10 != 0 ) {
      n = n - 1 ;
    }
    else {
      n = n / 10 ;
    }
  }
  System . out . println ( n ) ;
}

public static void main ( String [ ] args ) { Scanner sc = new Scanner ( System . in ) ; String str = sc . nextLine ( ) ; int n = Integer . parseInt ( str . substring ( 0 , str . indexOf ( " ▁ " ) ) ) ; int k = Integer . parseInt ( str . substring ( str . indexOf ( " ▁ " ) + 1 , str . length ( ) ) ) ; for ( int i = 1 ; i <= k ; i ++ ) { if ( n % 10 != 0 ) { n = n - 1 ; } else { n = n / 10 ; } } System . out . println ( n ) ; }
(method_declaration (modifiers) type: (void_type) name: (identifier) parameters: (formal_parameters (formal_parameter type: (array_type element: (type_identifier) dimensions: (dimensions)) name: (identifier))) 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: (type_identifier) 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 (method_invocation object: (identifier) name: (identifier) arguments: (argument_list (decimal_integer_literal) (method_invocation object: (identifier) name: (identifier) arguments: (argument_list (string_literal))))))))) (local_variable_declaration type: (integral_type) declarator: (variable_declarator name: (identifier) value: (method_invocation object: (identifier) name: (identifier) arguments: (argument_list (method_invocation object: (identifier) name: (identifier) arguments: (argument_list (binary_expression left: (method_invocation object: (identifier) name: (identifier) arguments: (argument_list (string_literal))) right: (decimal_integer_literal)) (method_invocation object: (identifier) name: (identifier) arguments: (argument_list)))))))) (for_statement init: (local_variable_declaration type: (integral_type) declarator: (variable_declarator name: (identifier) value: (decimal_integer_literal))) condition: (binary_expression left: (identifier) right: (identifier)) update: (update_expression (identifier)) body: (block (if_statement condition: (parenthesized_expression (binary_expression left: (binary_expression left: (identifier) right: (decimal_integer_literal)) right: (decimal_integer_literal))) consequence: (block (expression_statement (assignment_expression left: (identifier) right: (binary_expression left: (identifier) right: (decimal_integer_literal))))) alternative: (block (expression_statement (assignment_expression left: (identifier) right: (binary_expression left: (identifier) right: (decimal_integer_literal)))))))) (expression_statement (method_invocation object: (field_access object: (identifier) field: (identifier)) name: (identifier) arguments: (argument_list (identifier))))))