Decoder

All Sith messages are sent using a complex coding scheme. You have cracked their code and must write a program to decode coded messages.

The code works as follows:

• Each word in the coded message represents one letter of the decoded message.
• For the first word, use its first letter.
• For every following word, use its $n$-th letter, where $n$ is the length of the previous word.
• If the previous word is longer than the current word, the current word represents a space (a blank).

The first line contains a positive integer $n$. It is followed by $n$ words that make up the coded message.

Print the decoded message on a single line.