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#!perl -pl
map{$_.=(!y/IVXLC/XLCDM/,I,II,III,IV,V,VI,VII,VIII,IX)[$&]while s/\d//
+;$$_=$n++}@R=0..3999;
y/mp/-+/;s/\w+/${$&}/g;$_=$R[eval]

#!perl -pl
map{y/IVXLC/XLCDM//s//$&-9?$&-4?I x$&:IV:IX/e&s/I{5}/V/while/\d/;$$_=$
+n++}@R=0..3999;
y/m/-/;s/\w+/+${$&}/g;$_=$R[eval]

#!perl -pla
%n=I1V5X10L50C100D500M1000=~/(.)(\d+)/g;sub
d{$#_-=$z*2*(@_&&$z<$_)-($z=$_)for@n{/./g};@_}$t+=($.=/p/-/n/||$.)*d
for@F;map{$s.=$_ x($t/d),$t%=d}M,CM,D,CD,C,XC,L,XL,X,IX,V,IV,I;$_=$s