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

[Q]: Sentence: 'two zebra stand near the wooden posts on a building'. Find frequency of the letter 't'
[A]: 4


[Q]: Sentence: 'young boy flying kite in large field at outdoor event'. Find frequency of the letter 'y'
[A]: 3


[Q]: Sentence: 'an elephant with broken tusks stands in front of a hill and boulders'. Find frequency of the letter 'n'
[A]:
7