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

[EX Q]: Sentence: 'a tower with some bright lights and clocks on it'. Find frequency of the letter 'h'
[EX A]: 3

[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: 'several trains traveling on train tracks next to each other'. Find frequency of the letter 'k'
[EX A]:
1