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

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 large formal living room with yellow couches and table'. Find frequency of the letter 'v'

Output: 1


Input: Consider Input: Sentence: 'a big bathroom with a very large bath tub'. Find frequency of the letter 'y'


Output: 1