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

Input: Consider Input: Sentence: 'a man pushing a cart full of bananas'. Find frequency of the letter 'u'

Output: 2


Input: Consider Input: Sentence: 'a man paddle boarding by a boat dock in a city'. Find frequency of the letter 'o'

Output: 3


Input: Consider Input: Sentence: 'professional baseball players are in the infield warming up'. Find frequency of the letter 'e'


Output: 6