C - Chef and The Party

Sam has started to learn Latin. His instructor has assigned him a task in which he starts to type a Latin string using his keyboard consisting of $n$ lowercase Latin letters. Initially having an empty string, his instructor instructed Sam that he can perform the following operations until he types the whole full string. - $Append $ $a$ $character$ $to$ $the$ $end$ $of$ $the$ $string$. He fur