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

Input: Consider Input: Sentence: 'a car accident has slowed traffic as a clean up crew works'. Find frequency of the letter 'f'

Output: 2


Input: Consider Input: Sentence: 'a piece of bread stuffed with meat and vegetables'. Find frequency of the letter 's'

Output: 2


Input: Consider Input: Sentence: 'three people a lamp and a mini mouse umbrella'. Find frequency of the letter 'o'


Output: 2