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

Input: Consider Input: Sentence: 'seagulls sit on the posts of a seaside balcony by a clock tower'. Find frequency of the letter 'g'

Output: 1


Input: Consider Input: Sentence: 'a softball player holding the bat on first base'. Find frequency of the letter 't'

Output: 4


Input: Consider Input: Sentence: 'a person uses a knife to cut up some bell peppers'. Find frequency of the letter 't'


Output: 2