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

Input: Consider Input: Sentence: 'a group of workers washing and cleaning fruits and vegetables'. Find frequency of the letter 'i'

Output: 3


Input: Consider Input: Sentence: 'a woman with short, brown hair is looking into a circular mirror and holding a camera up to her cheek'. Find frequency of the letter 'e'

Output: 4


Input: Consider Input: Sentence: 'a police tow truck parked outside of a multi-story brick building'. Find frequency of the letter 'c'


Output: 3