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

Input: Consider Input: Sentence: 'the meal is served and ready to be eaten'. Find frequency of the letter 'e'

Output: 8


Input: Consider Input: Sentence: 'there is a sandwich with a lot of meat cut in half'. Find frequency of the letter 'a'

Output: 5


Input: Consider Input: Sentence: 'a woman with a cake in a room'. Find frequency of the letter 'n'


Output: 2