enum M{M;int i,j,k;{for(String s,t="I";i++<20;){System.out.print(s=t+"\n");t="";k=s.charAt(j=0);for(int b:s.getBytes())if(b==k)j++;else{t+=" I II III IV V".split(" ")[j]+(char)k;j=1;k=b;}}}}
Note that non-ascii characters in the above source code will be escaped (such as \x9f).