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

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 man in a suit makes the first slice into a cake'. Find frequency of the letter 't'

Output: 4


Input: Consider Input: Sentence: 'a group of people on bicycles next to a passing train'. Find frequency of the letter 'e'


Output: 4