TORONTO KIDS COMPUTER CLUB | PMCA Sunday 10:00 Practice -02.28
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PMCA Sunday 10:00 Practice -02.28

03 Mar PMCA Sunday 10:00 Practice -02.28


Today in gym class, your class decided to play dodgeball, and Jack is selected as one of the team captains! N students are lined up in a row, waiting to be put on teams. Jack is allowed to pick multiple students as long as they are adjacent to one another, and the first letter of each of their names are the same (case insensitive).

As an assistant to Jack, help him decide what his first choice should be by writing a program to determine all the possible choices he could make!

Input Specification
The first line contains the integer N (1N105), representing the total number of students.

The second line contains N space separated strings, each representing the name of the ith student in line. Each name will be no longer than 20 characters and only contain letters from the English alphabet.

Output Specification
Output one integer, representing the total number of choices Jack can make.

Sample Input
Sarah Timmy Turner Betty Bob

Sample Output

Explanation for Sample Input
The possible groups of people that aurpine could choose are:
Timmy, Turner
Betty, Bob
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