Create HackerRank Tweets.py

Increasing popularity of hackerrank can be seen in tweets like

I love #hackerrank
I just scored 27 points in the Picking Cards challenge on #HackerRank
I just signed up for summer cup @hackerrank
Given a set of most popular tweets, your task is to find out how many of those tweets has the string hackerrank in it.

Input Format

First line is an integer N. N lines follow. Each line is a valid tweet.

Constraints

1 <= N <= 10
Each character of the tweet is a valid ASCII character.

Output format

Print the total number of tweets that has hackerrank (case insensitive) in it

Sample Input

4
I love #hackerrank
I just scored 27 points in the Picking Cards challenge on #HackerRank
I just signed up for summer cup @hackerrank
interesting talk by hari, co-founder of hackerrank
Sample Output

4
Explanation

All the 4 lines have the string hackerrank in them and thus 4.