#!/usr/bin/env python3

import sys
from xml.etree import ElementTree

class Text(ElementTree.Element):
  pass

class CustomTreeBuilder(ElementTree.TreeBuilder):
  def start(self, tag, attrs):
    self.ctext = ['']
    super().start(tag, attrs)
  def end(self, tag):
    self.ctext = ['']
    super().end(tag)
  def comment(self, text):
    self.ctext = ['']
    super().comment(text)
  def data(self, data):
    if not self.ctext:
      self.ctext = ['']
    if self.ctext[0]:
      self.ctext[0] += data
    else:
      data = data.lstrip()
      self.ctext[0] += data
      if data:
        super().start(Text, {"text": self.ctext})
        super().end(Text)

def convert(inp=sys.stdin, outp=sys.stdout):
  tree = ElementTree.parse(inp, ElementTree.XMLParser(target=CustomTreeBuilder(insert_comments=True)))
  root = tree.getroot()
  def sub(e, n, nosp=False):
    if e.tag == Text:
      etag = '!'
    elif e.tag == ElementTree.Comment:
      etag = '!--'
    else:
      etag = e.tag.replace('\\','\\\\').replace('>','\\>').replace('/','\\/').replace(' ','\\ ')
      if etag[0] == '!':
        etag = '\\!' + etag
    text=''
    if etag == '!--':
      text = e.text
    elif etag == '!':
      text = e.attrib['text'][0]
    if text:
      text = text.strip()
    if not nosp:
      outp.write(' ' * n)
    outp.write(f'<{etag}')
    if e.tag != Text:
      for key, value in e.attrib.items():
        key = key.replace('\\','\\\\').replace('>','\\>').replace('/','\\/').replace('=','\\=')
        outp.write(f' {key}')
        if value is not None:
          value = value.replace('\\','\\\\').replace('"','\\"')
          outp.write(f'="{value}"')
    if len(e) or text:
      outp.write('>')
      if text:
        if '\n' in text:
          outp.write('\n')
        outp.write(text.replace('\\','\\\\').replace('<','\\<'))
        if '\n' in text:
          outp.write('\n' + (' ' * (n - nosp * 2)))
      else:
        onlytext = len(e) == 1 and not isinstance(e[0].tag, str)
        if not onlytext:
          outp.write('\n')
        for child in e:
          sub(child, n+2, onlytext)
        if not onlytext:
          outp.write(' ' * n)
      outp.write(f'</{etag}>')
    else:
      outp.write('/>')
    if not nosp:
      outp.write('\n')
  sub(root, 0)

if __name__ == '__main__':
  convert()