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

Input: Consider Input: Sentence: 'two young ladies that are dancing in the room together'. Find frequency of the letter 'a'

Output: 4


Input: Consider Input: Sentence: 'a boy catching a frisbee while standing ins bunch of leaves'. Find frequency of the letter 'a'

Output: 5


Input: Consider Input: Sentence: 'a player at bat has just hit this baseball'. Find frequency of the letter 'e'


Output: 2