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

Ex Input:
Sentence: 'this is a close up view of a tennis player during the game'. Find frequency of the letter 't'

Ex Output:
3


Ex Input:
Sentence: 'cars parked outside if a retail store'. Find frequency of the letter 'd'

Ex Output:
2


Ex Input:
Sentence: 'the food is sitting on two plates on the table'. Find frequency of the letter 'e'

Ex Output:

4