import xml.dom.minidom, sys
from CompactTokenizer import CompactTokenizer

def expand(elem):
    global ct,doc
    ct.skip("[")
    while ct.getToken()=='@':
        attName = ct.nextToken()
        ct.nextToken()
        elem.setAttribute(attName,ct.skip("["))
        ct.nextToken()
        ct.skip("]")
    while ct.getToken()!=']':
        s=ct.getToken().strip()
        ct.nextToken()
        if ct.getToken()=="[":
            expand(elem.appendChild(doc.createElement(s.strip())))
        else:
            elem.appendChild(doc.createTextNode(s))
    ct.skip("]")
    return elem

doc = xml.dom.minidom.Document()
ct = CompactTokenizer(sys.stdin)
while ct.nextToken()!='[':
    rootName=ct.getToken()
expand(doc.appendChild(doc.createElement(rootName.strip())))

print (doc.toprettyxml("  "))