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

Input: Consider Input: Sentence: 'the bathroom is in need of remodel'. Find frequency of the letter 'e'

Output: 5


Input: Consider Input: Sentence: 'a large bathroom with marble floor, counter, and bath'. Find frequency of the letter 'f'

Output: 1


Input: Consider Input: Sentence: 'a boy eating a donut on a string blind folded'. Find frequency of the letter 'b'


Output: 2