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

Ex Input:
Sentence: 'the ingredients are ready on the wooden table'. Find frequency of the letter 'w'

Ex Output:
1


Ex Input:
Sentence: 'a pizza pie sitting on a wooden table with tongs'. Find frequency of the letter 't'

Ex Output:
5


Ex Input:
Sentence: 'a baby elephant walks beside an adult elephant along a post and cable'. Find frequency of the letter 'l'

Ex Output:

6