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

[EX Q]: Sentence: 'a boy swinging a bat while playing baseball'. Find frequency of the letter 'h'
[EX A]: 1

[EX Q]: Sentence: 'a woman sitting in front of a giant slice of cheese pizza'. Find frequency of the letter 'e'
[EX A]: 4

[EX Q]: Sentence: 'a man is photoed eating a large sandwich he is holding'. Find frequency of the letter 'd'
[EX A]:
3