Increasing popularity of hackerrank can be seen in tweets like
Given a set of most popular tweets, your task is to find out how many of
those tweets has the string hackerrank in it.
First line is an integer N. N lines follow. Each line is a valid tweet.
1 <= N <= 10
Each character of the tweet is a valid ASCII character.
Print the total number of tweets that has hackerrank (case insensitive) in it
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
All the 4 lines have the string hackerrank in them and thus 4.
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