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.
Constraints:
1 <= N <= 10- Each character of the tweet is a valid ASCII character.