public static void main ( String [ ] args ) {
  Scanner scanner = new Scanner ( System . in ) ;
  long n = scanner . nextLong ( ) ;
  int k = scanner . nextInt ( ) ;
  long l = 0 ;
  while ( k -- != 0 ) {
    l = n % 10 ;
    if ( l == 0 ) {
      n = n / 10 ;
    }
    else {
      n = n - 1 ;
    }
  }
  System . out . println ( n ) ;
}

public static void main ( String [ ] args ) { Scanner scanner = new Scanner ( System . in ) ; long n = scanner . nextLong ( ) ; int k = scanner . nextInt ( ) ; long l = 0 ; while ( k -- != 0 ) { l = n % 10 ; if ( l == 0 ) { n = n / 10 ; } else { n = n - 1 ; } } 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: (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: (integral_type) declarator: (variable_declarator name: (identifier) value: (decimal_integer_literal))) (while_statement condition: (parenthesized_expression (binary_expression left: (update_expression (identifier)) right: (decimal_integer_literal))) body: (block (expression_statement (assignment_expression left: (identifier) right: (binary_expression left: (identifier) right: (decimal_integer_literal)))) (if_statement condition: (parenthesized_expression (binary_expression left: (identifier) 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))))))