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

Input: Consider Input: Sentence: 'a truck is parked in front of a store'. Find frequency of the letter 't'

Output: 3

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

Output: 2

Input: Consider Input: Sentence: 'the two figurine is beside a slice of pizza on a tray'. Find frequency of the letter 'i'
Output: 6