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

[Q]: Sentence: 'two bigger elephants standing with a small elephant'. Find frequency of the letter 't'
[A]: 5


[Q]: Sentence: 'man in a sleeping bag on the floor using a laptop computer'. Find frequency of the letter 'i'
[A]: 3


[Q]: Sentence: 'a hot dog that has ketchup and mayonnaise on top of it'. Find frequency of the letter 't'
[A]:
6