In this task, you need to count the number of times the given letter appears in the given sentence.
--------
Question: Sentence: 'a bird is standing on the ledge of the building'. Find frequency of the letter 't'

Answer: 3


Question: Sentence: 'a line of people on motorcycles on the road'. Find frequency of the letter 'e'

Answer: 5


Question: Sentence: 'old make shift boat houses are on the water'. Find frequency of the letter 'e'

Answer:
5