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 young girl skiing down a snowy mountain'. Find frequency of the letter 'l'

Output: 1


Input: Consider Input: Sentence: 'a person riding a camel in front of a truck'. Find frequency of the letter 't'


Output: 2