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

Input: Consider Input: Sentence: 'an empty clean kitchen with island, marble countertops , stove and cabinetry'. Find frequency of the letter 'l'

Output: 3


Input: Consider Input: Sentence: 'a woman is looking at sheep off in a field'. Find frequency of the letter 'm'

Output: 1


Input: Consider Input: Sentence: 'a giraffe is standing while looking to the side with other giraffes behind him in the distance'. Find frequency of the letter 'l'


Output: 2