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

Ex Input:
Sentence: 'one woman holding a video game controller and standing next to another woman'. Find frequency of the letter 't'

Ex Output:
5


Ex Input:
Sentence: 'a doll with huge eyes and black hair with blunt bangs holds a red umbrella'. Find frequency of the letter 'e'

Ex Output:
5


Ex Input:
Sentence: 'a baseball player tightens his gloves before the next pitch'. Find frequency of the letter 't'

Ex Output:

5