When playing the cities game each player has to name a city, and the next player has to name a city that starts with the last letter of the city that was just named. So, if someone said
Moscow, the next player can say
Given a game where each new city is separated from the previous one with a comma and a space, your task is to find out if it’s a valid game. Otherwise, you should tell that someone has already lost.
The input contains a single line where each named city is separated by a
', 'from the previous one.
The program should output
Go onif the game is valid so far, and
Stop!if someone messed up in the chain of cities.
Moscow, Warsaw, West Jordan, Nashville