public static void main ( String [ ] args ) throws IOException {
  BufferedReader br = new BufferedReader ( new InputStreamReader ( System . in ) ) ;
  String s = br . readLine ( ) ;
  int h = 0 ;
  int i = 0 ;
  while ( i + 1 < s . length ( ) ) {
    if ( s . charAt ( i + 1 ) == '/' ) {
      h -- ;
      for ( int j = 0 ;
      j < 2 * h ;
      j ++ ) {
        System . out . print ( ' ' ) ;
      }
      System . out . println ( s . substring ( i , i + 4 ) ) ;
      i += 4 ;
    }
    else {
      for ( int j = 0 ;
      j < 2 * h ;
      j ++ ) {
        System . out . print ( ' ' ) ;
      }
      System . out . println ( s . substring ( i , i + 3 ) ) ;
      i += 3 ;
      h ++ ;
    }
  }
}

public static void main ( String [ ] args ) throws IOException { BufferedReader br = new BufferedReader ( new InputStreamReader ( System . in ) ) ; String s = br . readLine ( ) ; int h = 0 ; int i = 0 ; while ( i + 1 < s . length ( ) ) { if ( s . charAt ( i + 1 ) == ' / ' ) { h -- ; for ( int j = 0 ; j < 2 * h ; j ++ ) { System . out . print ( ' ▁ ' ) ; } System . out . println ( s . substring ( i , i + 4 ) ) ; i += 4 ; } else { for ( int j = 0 ; j < 2 * h ; j ++ ) { System . out . print ( ' ▁ ' ) ; } System . out . println ( s . substring ( i , i + 3 ) ) ; i += 3 ; h ++ ; } } }
(method_declaration (modifiers) type: (void_type) name: (identifier) parameters: (formal_parameters (formal_parameter type: (array_type element: (type_identifier) dimensions: (dimensions)) name: (identifier))) (throws (type_identifier)) body: (block (local_variable_declaration type: (type_identifier) declarator: (variable_declarator name: (identifier) value: (object_creation_expression type: (type_identifier) arguments: (argument_list (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: (decimal_integer_literal))) (local_variable_declaration type: (integral_type) declarator: (variable_declarator name: (identifier) value: (decimal_integer_literal))) (while_statement condition: (parenthesized_expression (binary_expression left: (binary_expression left: (identifier) right: (decimal_integer_literal)) right: (method_invocation object: (identifier) name: (identifier) arguments: (argument_list)))) body: (block (if_statement condition: (parenthesized_expression (binary_expression left: (method_invocation object: (identifier) name: (identifier) arguments: (argument_list (binary_expression left: (identifier) right: (decimal_integer_literal)))) right: (character_literal))) consequence: (block (expression_statement (update_expression (identifier))) (for_statement init: (local_variable_declaration type: (integral_type) declarator: (variable_declarator name: (identifier) value: (decimal_integer_literal))) condition: (binary_expression left: (identifier) right: (binary_expression left: (decimal_integer_literal) right: (identifier))) update: (update_expression (identifier)) body: (block (expression_statement (method_invocation object: (field_access object: (identifier) field: (identifier)) name: (identifier) arguments: (argument_list (character_literal)))))) (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 (identifier) (binary_expression left: (identifier) right: (decimal_integer_literal))))))) (expression_statement (assignment_expression left: (identifier) right: (decimal_integer_literal)))) alternative: (block (for_statement init: (local_variable_declaration type: (integral_type) declarator: (variable_declarator name: (identifier) value: (decimal_integer_literal))) condition: (binary_expression left: (identifier) right: (binary_expression left: (decimal_integer_literal) right: (identifier))) update: (update_expression (identifier)) body: (block (expression_statement (method_invocation object: (field_access object: (identifier) field: (identifier)) name: (identifier) arguments: (argument_list (character_literal)))))) (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 (identifier) (binary_expression left: (identifier) right: (decimal_integer_literal))))))) (expression_statement (assignment_expression left: (identifier) right: (decimal_integer_literal))) (expression_statement (update_expression (identifier)))))))))