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

Input: Consider Input: Sentence: 'a closeup view of a bathroom sink, that is very modern'. Find frequency of the letter 'e'

Output: 4


Input: Consider Input: Sentence: 'a train on a train track going through a bunch of trees'. Find frequency of the letter 'u'

Output: 2


Input: Consider Input: Sentence: 'a man swinging a bat while playing baseball'. Find frequency of the letter 'm'


Output: 1