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

Ex Input:
Sentence: 'the interior of a living and dining room'. Find frequency of the letter 'i'

Ex Output:
6


Ex Input:
Sentence: 'red chair next to side table with lamp in residential home'. Find frequency of the letter 'm'

Ex Output:
2


Ex Input:
Sentence: 'two tennis player in the court playing as the crowd watch'. Find frequency of the letter 't'

Ex Output:

6