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

Input: Consider Input: Sentence: 'a man holding a brown paper bag kite'. Find frequency of the letter 'b'

Output: 2


Input: Consider Input: Sentence: 'many different species of sheep in display at a museum'. Find frequency of the letter 'h'

Output: 1


Input: Consider Input: Sentence: 'a giraffe that has a mountain behind it'. Find frequency of the letter 'd'


Output: 1