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

[Q]: Sentence: 'a passenger train that is going over a bridge'. Find frequency of the letter 't'
[A]: 3


[Q]: Sentence: 'a bunch of people are standing out in a field a red one has their arms out as a white ball is in the air'. Find frequency of the letter 'e'
[A]: 9


[Q]: Sentence: 'a glass filled with water next to a bar with colorful kites'. Find frequency of the letter 'c'
[A]:
1