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

Ex Input:
Sentence: 'people seated on a table looking very happy'. Find frequency of the letter 'g'

Ex Output:
1


Ex Input:
Sentence: 'a batter, catcher and umpire waiting for the pitch and a major league baseball game'. Find frequency of the letter 'c'

Ex Output:
3


Ex Input:
Sentence: 'a child feeding a giraffe from the palm of his hand'. Find frequency of the letter 'f'

Ex Output:

5