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

[EX Q]: Sentence: 'there is an old stove with old pots on the burners'. Find frequency of the letter 't'
[EX A]: 5

[EX Q]: Sentence: 'a girl hitting a tennis ball on a court'. Find frequency of the letter 'l'
[EX A]: 3

[EX Q]: Sentence: 'a bowl full of bright oranges sitting on a wooden surface'. Find frequency of the letter 'f'
[EX A]:
3