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

[EX Q]: Sentence: 'four men standing around two pizzas in a conference room'. Find frequency of the letter 't'
[EX A]: 2

[EX Q]: Sentence: 'a woman is taking a sip of a drink from a glass'. Find frequency of the letter 'i'
[EX A]: 4

[EX Q]: Sentence: 'martha stewart holding a fluffy siamese cat on her arms'. Find frequency of the letter 'm'
[EX A]:
3