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

Input: Consider Input: Sentence: 'a red building with a crowd of people outside it near the water'. Find frequency of the letter 'e'

Output: 7


Input: Consider Input: Sentence: 'a street scene looking at the back of the stop sign'. Find frequency of the letter 't'

Output: 6


Input: Consider Input: Sentence: 'a wooden table topped with lots of fresh vegetables'. Find frequency of the letter 'l'


Output: 3