# -*- coding: utf-8 -*-
import xml.dom
from xml.dom import Node
from xml.dom.minidom import parse
import sys

def strip_space(node):
    child=node.firstChild
    while child!=None:
        c=child.nextSibling
        if (child.nodeType==Node.TEXT_NODE and 
            len(child.nodeValue.strip())==0):
            node.removeChild(child)
        else:
            strip_space(child)
        child=c
    return node

#  use sys.stdout.write instead of print to control the output
#  i.e. without added spaces between elements to print
def compact(node,indent):
    if node==None: return
    if node.nodeType==Node.ELEMENT_NODE:
        sys.stdout.write(node.nodeName+'[')
        indent += (len(node.nodeName)+1)*" "
        attrs = node.attributes
        first=True
        for i in range(len(attrs)):
            if not first: sys.stdout.write('\n'+indent)
            sys.stdout.write('@'+attrs.item(i).nodeName + 
                             '['+attrs.item(i).nodeValue+']')
            first=False
        child=node.firstChild
        while child!=None:
            if not first: sys.stdout.write('\n'+indent)
            compact(child,indent)
            first=False
            child=child.nextSibling
        sys.stdout.write(']')
    elif node.nodeType==Node.TEXT_NODE:
        sys.stdout.write(node.nodeValue.strip())

doc = parse(sys.stdin)
compact(strip_space(doc.documentElement),"")
sys.stdout.write('\n')