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

Input: Consider Input: Sentence: 'oranges are sitting in a bowl on a table'. Find frequency of the letter 'a'

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: 'a red train stopped at a train station'. Find frequency of the letter 't'


Output: 6