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

Input: Consider Input: Sentence: 'two zebra stand near the wooden posts on a building'. Find frequency of the letter 't'

Output: 4


Input: Consider Input: Sentence: 'a white bowl filled with peeled orange slices'. Find frequency of the letter 's'

Output: 2


Input: Consider Input: Sentence: 'a woman in a restaurant is eating a chili dog'. Find frequency of the letter 'i'


Output: 5