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

Input: Consider Input: Sentence: 'the bathroom is in need of remodel'. Find frequency of the letter 'e'

Output: 5

Input: Consider Input: Sentence: 'a woman swinging a tennis racquet towards a tennis ball'. Find frequency of the letter 'e'

Output: 3

Input: Consider Input: Sentence: 'a man and two women posing for a picture in front of a christmas tree'. Find frequency of the letter 't'
Output: 5