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You probably know about HTML, the mark up language used to create Web pages. HTML code contains a number of tags which are expected to follow certain rules.
In this problem we will be concerned with two of these rules:
Tags are marked by angled brackets which contain a keyword, such as
<strong>. These are opening tags, the corresponding closing tags having
/ before the keyword, ie
</strong>. It is possible for a tag to be both opening and closing, such as
<br />, which complies with rule 1.
To be properly nested, if a tag is opened inside another tag, it must be closed before the other tag closes. For example
<body> <strong> </strong> </body>is properly nested
<body> <strong> </body> </strong>is not, and breaks rule 2.
If there are no tags present, the text complies with both rules.
Attributes may be present within an opening tag, such as
<a href="http://www.nzprogcontest.org.nz">This is a link</a>
The closing tag has only to match the keyword, not the attributes.
Input will consist of a number of lines of HTML code, each line containing from 0 to 255 characters. The last line will contain a single # character – do not process this line. Within the text of each line will be zero or more tags. No angle bracket will be present unless it is part of a properly formed tag.
Determine whether or not the HTML meets the rules specified above.
Output will consist of a single line for each line of input. The line will contain either the word legal, or the word illegal.
<body> <strong>Oops, this is</body> naughty </strong> <body> <strong>Hello</strong> <br /> </body> Just text, no tags. <p> Oh dear, we are missing something. <a href="http://www.nzprogcontest.org.nz">This is a link</a> #
illegal legal legal illegal legal