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

Input: Consider Input: Sentence: 'this marketplace has a lot of fresh fruit and vegetables'. Find frequency of the letter 'v'

Output: 1


Input: Consider Input: Sentence: 'a man riding on the back of a white horse next to other horses'. Find frequency of the letter 'o'

Output: 6


Input: Consider Input: Sentence: 'two toilets facing one another with privacy barrier'. Find frequency of the letter 'n'


Output: 3