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

Input: Consider Input: Sentence: 'many different species of sheep in display at a museum'. Find frequency of the letter 'h'

Output: 1


Input: Consider Input: Sentence: 'a man and a woman are walking down the street with an umbrella over their heads'. Find frequency of the letter 'w'

Output: 4


Input: Consider Input: Sentence: 'open bottles of various wines on a glass table'. Find frequency of the letter 'o'


Output: 5