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

Input: Consider Input: Sentence: 'some cubbies with towels in a blue bathroom'. Find frequency of the letter 'l'

Output: 2


Input: Consider Input: Sentence: 'an orange cat sitting on the ground next to a  purse'. Find frequency of the letter 's'

Output: 2


Input: Consider Input: Sentence: 'a man in the bathroom shaving his face'. Find frequency of the letter 'v'


Output: 1