public static void main ( String [ ] args ) {
  Scanner sc = new Scanner ( System . in ) ;
  int n = sc . nextInt ( ) ;
  int k = sc . nextInt ( ) ;
  sc . nextLine ( ) ;
  String s = sc . nextLine ( ) ;
  if ( n == 1 && k == 1 ) {
    System . out . println ( 0 ) ;
    return ;
  }
  if ( k == 0 ) {
    System . out . println ( s ) ;
    return ;
  }
  StringBuilder str = new StringBuilder ( s ) ;
  for ( int i = 0 ;
  i < str . length ( ) && k > 0 ;
  i ++ ) {
    if ( i == 0 ) {
      if ( str . charAt ( i ) != '1' ) {
        str . setCharAt ( i , '1' ) ;
        k -- ;
      }
      else {
        continue ;
      }
    }
    else {
      if ( str . charAt ( i ) == '0' ) {
        continue ;
      }
      else {
        str . setCharAt ( i , '0' ) ;
        k -- ;
      }
    }
  }
  System . out . println ( str . toString ( ) ) ;
}

public static void main ( String [ ] args ) { Scanner sc = new Scanner ( System . in ) ; int n = sc . nextInt ( ) ; int k = sc . nextInt ( ) ; sc . nextLine ( ) ; String s = sc . nextLine ( ) ; if ( n == 1 && k == 1 ) { System . out . println ( 0 ) ; return ; } if ( k == 0 ) { System . out . println ( s ) ; return ; } StringBuilder str = new StringBuilder ( s ) ; for ( int i = 0 ; i < str . length ( ) && k > 0 ; i ++ ) { if ( i == 0 ) { if ( str . charAt ( i ) != '1' ) { str . setCharAt ( i , '1' ) ; k -- ; } else { continue ; } } else { if ( str . charAt ( i ) == '0' ) { continue ; } else { str . setCharAt ( i , '0' ) ; k -- ; } } } System . out . println ( str . toString ( ) ) ; }
(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)))) (expression_statement (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)))) (if_statement condition: (parenthesized_expression (binary_expression left: (binary_expression left: (identifier) right: (decimal_integer_literal)) right: (binary_expression left: (identifier) right: (decimal_integer_literal)))) consequence: (block (expression_statement (method_invocation object: (field_access object: (identifier) field: (identifier)) name: (identifier) arguments: (argument_list (decimal_integer_literal)))) (return_statement))) (if_statement condition: (parenthesized_expression (binary_expression left: (identifier) right: (decimal_integer_literal))) consequence: (block (expression_statement (method_invocation object: (field_access object: (identifier) field: (identifier)) name: (identifier) arguments: (argument_list (identifier)))) (return_statement))) (local_variable_declaration type: (type_identifier) declarator: (variable_declarator name: (identifier) value: (object_creation_expression type: (type_identifier) arguments: (argument_list (identifier))))) (for_statement init: (local_variable_declaration type: (integral_type) declarator: (variable_declarator name: (identifier) value: (decimal_integer_literal))) condition: (binary_expression left: (binary_expression left: (identifier) right: (method_invocation object: (identifier) name: (identifier) arguments: (argument_list))) right: (binary_expression left: (identifier) right: (decimal_integer_literal))) update: (update_expression (identifier)) body: (block (if_statement condition: (parenthesized_expression (binary_expression left: (identifier) right: (decimal_integer_literal))) consequence: (block (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 (method_invocation object: (identifier) name: (identifier) arguments: (argument_list (identifier) (character_literal)))) (expression_statement (update_expression (identifier)))) alternative: (block (continue_statement)))) alternative: (block (if_statement condition: (parenthesized_expression (binary_expression left: (method_invocation object: (identifier) name: (identifier) arguments: (argument_list (identifier))) right: (character_literal))) consequence: (block (continue_statement)) alternative: (block (expression_statement (method_invocation object: (identifier) name: (identifier) arguments: (argument_list (identifier) (character_literal)))) (expression_statement (update_expression (identifier))))))))) (expression_statement (method_invocation object: (field_access object: (identifier) field: (identifier)) name: (identifier) arguments: (argument_list (method_invocation object: (identifier) name: (identifier) arguments: (argument_list)))))))