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

Input: Consider Input: Sentence: 'silhouette of person playing frisbee with moutain and sunset'. Find frequency of the letter 'i'

Output: 5


Input: Consider Input: Sentence: 'a grapefruit, toast, coffee and other items are on a tray'. Find frequency of the letter 't'

Output: 6


Input: Consider Input: Sentence: 'the monument in front of the fence has signs in a foreign language'. Find frequency of the letter 'a'


Output: 4