slope lines by Bjarke Walling

L=len\x0d
R=raw_input\x0d
a=[R()]\x0d
_=L(a[0])\x0d
while _>1-L(a):\x0d
\x09try:i=R();_=max(L(i)-L(a),_);a+=[i]\x0d
\x09except:R=0\x0d
\x09_-=1;print'  '*abs(_)+'___'.join([(l+'_'*99)[_+i]for i,l in enumerate(a)if _+i>=0]).rstrip('_').replace('_',' ')

Note that non-ascii characters in the above source code will be escaped (such as \x9f).

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