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

Ex Input:
Sentence: 'a plastic tray that has different foods inside of it'. Find frequency of the letter 't'

Ex Output:
6


Ex Input:
Sentence: 'soccer players on opposite teams fight for control over a ball'. Find frequency of the letter 't'

Ex Output:
4


Ex Input:
Sentence: 'plate made up of meat and a variety of vegetables'. Find frequency of the letter 'e'

Ex Output:

7