public static void main ( String [ ] args ) {
  Scanner scan = new Scanner ( System . in ) ;
  String str ;
  int nested = 0 , i , j ;
  int [ ] degree = new int [ 26 ] ;
  char [ ] ch = new char [ 1000 ] ;
  str = scan . next ( ) ;
  ch = str . toCharArray ( ) ;
  for ( i = 0 ;
  i < str . length ( ) ;
  ++ i ) if ( ch [ i ] >= 'a' && ch [ i ] <= 'z' ) {
    if ( ch [ i - 1 ] == '<' ) {
      for ( j = 1 ;
      j <= 2 * nested ;
      ++ j ) System . out . print ( " " ) ;
      System . out . println ( "<" + ch [ i ] + ">" ) ;
      ++ nested ;
    }
    else if ( ch [ i - 1 ] == '/' ) {
      -- nested ;
      for ( j = 1 ;
      j <= 2 * nested ;
      ++ j ) System . out . print ( " " ) ;
      System . out . println ( "</" + ch [ i ] + ">" ) ;
    }
  }
}

public static void main ( String [ ] args ) { Scanner scan = new Scanner ( System . in ) ; String str ; int nested = 0 , i , j ; int [ ] degree = new int [ 26 ] ; char [ ] ch = new char [ 1000 ] ; str = scan . next ( ) ; ch = str . toCharArray ( ) ; for ( i = 0 ; i < str . length ( ) ; ++ i ) if ( ch [ i ] >= ' a ' && ch [ i ] <= ' z ' ) { if ( ch [ i - 1 ] == ' < ' ) { for ( j = 1 ; j <= 2 * nested ; ++ j ) System . out . print ( " ▁ " ) ; System . out . println ( " < " + ch [ i ] + " > " ) ; ++ nested ; } else if ( ch [ i - 1 ] == ' / ' ) { -- nested ; for ( j = 1 ; j <= 2 * nested ; ++ j ) System . out . print ( " ▁ " ) ; System . out . println ( " < / " + ch [ i ] + " > " ) ; } } }
(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))) (local_variable_declaration type: (integral_type) declarator: (variable_declarator name: (identifier) value: (decimal_integer_literal)) declarator: (variable_declarator name: (identifier)) declarator: (variable_declarator name: (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 (decimal_integer_literal))))) (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 (decimal_integer_literal))))) (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)))) (for_statement init: (assignment_expression left: (identifier) right: (decimal_integer_literal)) condition: (binary_expression left: (identifier) right: (method_invocation object: (identifier) name: (identifier) arguments: (argument_list))) update: (update_expression (identifier)) body: (if_statement condition: (parenthesized_expression (binary_expression left: (binary_expression left: (array_access array: (identifier) index: (identifier)) right: (character_literal)) right: (binary_expression left: (array_access array: (identifier) index: (identifier)) right: (character_literal)))) consequence: (block (if_statement condition: (parenthesized_expression (binary_expression left: (array_access array: (identifier) index: (binary_expression left: (identifier) right: (decimal_integer_literal))) right: (character_literal))) consequence: (block (for_statement init: (assignment_expression left: (identifier) right: (decimal_integer_literal)) condition: (binary_expression left: (identifier) right: (binary_expression left: (decimal_integer_literal) right: (identifier))) update: (update_expression (identifier)) body: (expression_statement (method_invocation object: (field_access object: (identifier) field: (identifier)) name: (identifier) arguments: (argument_list (string_literal))))) (expression_statement (method_invocation object: (field_access object: (identifier) field: (identifier)) name: (identifier) arguments: (argument_list (binary_expression left: (binary_expression left: (string_literal) right: (array_access array: (identifier) index: (identifier))) right: (string_literal))))) (expression_statement (update_expression (identifier)))) alternative: (if_statement condition: (parenthesized_expression (binary_expression left: (array_access array: (identifier) index: (binary_expression left: (identifier) right: (decimal_integer_literal))) right: (character_literal))) consequence: (block (expression_statement (update_expression (identifier))) (for_statement init: (assignment_expression left: (identifier) right: (decimal_integer_literal)) condition: (binary_expression left: (identifier) right: (binary_expression left: (decimal_integer_literal) right: (identifier))) update: (update_expression (identifier)) body: (expression_statement (method_invocation object: (field_access object: (identifier) field: (identifier)) name: (identifier) arguments: (argument_list (string_literal))))) (expression_statement (method_invocation object: (field_access object: (identifier) field: (identifier)) name: (identifier) arguments: (argument_list (binary_expression left: (binary_expression left: (string_literal) right: (array_access array: (identifier) index: (identifier))) right: (string_literal)))))))))))))