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

[Q]: Sentence: 'a truck is parked in front of a store'. Find frequency of the letter 't'
[A]: 3

[Q]: Sentence: 'a small boy in a high chair eating a cupcake'. Find frequency of the letter 'i'
[A]: 4

[Q]: Sentence: 'women on stools watch and feed the horses'. Find frequency of the letter 'c'
[A]:
1