public static void main ( String [ ] args ) {
  Scanner scanner = new Scanner ( System . in ) ;
  int n , k ;
  n = scanner . nextInt ( ) ;
  k = scanner . nextInt ( ) ;
  int [ ] arr = new int [ n ] ;
  int [ ] vis = new int [ n + 1 ] ;
  for ( int i = 0 ;
  i < 4 ;
  i ++ ) {
    arr [ i ] = scanner . nextInt ( ) ;
    vis [ arr [ i ] ] = 1 ;
  }
  if ( k < n + 1 || n == 4 ) {
    System . out . println ( - 1 ) ;
    return ;
  }
  int indx = 4 , vrtx = 1 ;
  while ( indx < n ) {
    while ( vis [ vrtx ] == 1 ) {
      vrtx ++ ;
    }
    arr [ indx ++ ] = vrtx ;
    vis [ vrtx ] = 1 ;
  };
}

public static void main ( String [ ] args ) { Scanner scanner = new Scanner ( System . in ) ; int n , k ; n = scanner . nextInt ( ) ; k = scanner . nextInt ( ) ; int [ ] arr = new int [ n ] ; int [ ] vis = new int [ n + 1 ] ; for ( int i = 0 ; i < 4 ; i ++ ) { arr [ i ] = scanner . nextInt ( ) ; vis [ arr [ i ] ] = 1 ; } if ( k < n + 1 || n == 4 ) { System . out . println ( - 1 ) ; return ; } int indx = 4 , vrtx = 1 ; while ( indx < n ) { while ( vis [ vrtx ] == 1 ) { vrtx ++ ; } arr [ indx ++ ] = vrtx ; vis [ vrtx ] = 1 ; } ; }
(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)) declarator: (variable_declarator name: (identifier))) (expression_statement (assignment_expression left: (identifier) right: (method_invocation object: (identifier) name: (identifier) arguments: (argument_list)))) (expression_statement (assignment_expression left: (identifier) right: (method_invocation object: (identifier) name: (identifier) arguments: (argument_list)))) (local_variable_declaration type: (array_type element: (integral_type) dimensions: (dimensions)) declarator: (variable_declarator name: (identifier) value: (array_creation_expression type: (integral_type) dimensions: (dimensions_expr (identifier))))) (local_variable_declaration type: (array_type element: (integral_type) dimensions: (dimensions)) declarator: (variable_declarator name: (identifier) value: (array_creation_expression type: (integral_type) dimensions: (dimensions_expr (binary_expression left: (identifier) right: (decimal_integer_literal)))))) (for_statement init: (local_variable_declaration type: (integral_type) declarator: (variable_declarator name: (identifier) value: (decimal_integer_literal))) condition: (binary_expression left: (identifier) right: (decimal_integer_literal)) update: (update_expression (identifier)) body: (block (expression_statement (assignment_expression left: (array_access array: (identifier) index: (identifier)) right: (method_invocation object: (identifier) name: (identifier) arguments: (argument_list)))) (expression_statement (assignment_expression left: (array_access array: (identifier) index: (array_access array: (identifier) index: (identifier))) right: (decimal_integer_literal))))) (if_statement condition: (parenthesized_expression (binary_expression left: (binary_expression left: (identifier) right: (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 (unary_expression operand: (decimal_integer_literal))))) (return_statement))) (local_variable_declaration type: (integral_type) declarator: (variable_declarator name: (identifier) value: (decimal_integer_literal)) declarator: (variable_declarator name: (identifier) value: (decimal_integer_literal))) (while_statement condition: (parenthesized_expression (binary_expression left: (identifier) right: (identifier))) body: (block (while_statement condition: (parenthesized_expression (binary_expression left: (array_access array: (identifier) index: (identifier)) right: (decimal_integer_literal))) body: (block (expression_statement (update_expression (identifier))))) (expression_statement (assignment_expression left: (array_access array: (identifier) index: (update_expression (identifier))) right: (identifier))) (expression_statement (assignment_expression left: (array_access array: (identifier) index: (identifier)) right: (decimal_integer_literal)))))))