Roman numeral by betaveros

I,V,X,L,C,D,M=1,5,10,50,100,500,1000;e=eval\x0d
while 1:\x0d
 s=raw_input();t=s[-1]\x0d
 for c in s[-2::-1]:\x0d
  t+='+-'[e(c)<e(t[-1])]+c\x0d
 print(e(t))

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

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