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

Input: Consider Input: Sentence: 'a person holding a wine glass in one hand and bread sticks in the other'. Find frequency of the letter 'd'

Output: 4

Input: Consider Input: Sentence: 'bathroom scene with a black cat going behind the door'. Find frequency of the letter 'e'

Output: 4

Input: Consider Input: Sentence: 'this simple train and train terminal are an example of life in the past'. Find frequency of the letter 'a'
Output: 8