Will rate if done in python.

Your favourite public transport company ETS wants to change signs on all bus stops. Some bus stops have quite a few buses that stop there and listing all the buses takes space. How- ever, if for example buses 141, 142, 143 stop there, we can write 141-143 instead and this saves space. Note that just for two buses this does not save space so no hyphen would be added You are given a list of buses that stop at a bus stop. What is the shortest representa- tion of this list? Input The first line of the input contains one integer N, 1