In this task, you need to count the number of times the given letter appears in the given sentence.

Input: Consider Input: Sentence: 'this is a close up view of a tennis player during the game'. Find frequency of the letter 't'

Output: 3


Input: Consider Input: Sentence: 'a man hits a tennis ball with a racket on the court'. Find frequency of the letter 'c'

Output: 2


Input: Consider Input: Sentence: 'a child throwing a ball towards a batter during a ballgame on a field'. Find frequency of the letter 'l'


Output: 6