enum _{_;System z;{try{String s="";int i,c=0,p=0;for(;(i=z.in.read())>0;p=i){if(p+1==i)c++;else{s+=(c>1?"-":"")+(c>0?(char)p:"")+(char)i;c=0;}}z.out.printf("%s-%c",s,p);}catch(Exception e){}}}