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

Q: Sentence: 'a man standing on a tennis court holding a racquet'. Find frequency of the letter 's'

A: 2
****
Q: Sentence: 'a scene at night; a plane alone on a runway with lit-up city buildings on the horizon'. Find frequency of the letter 'w'

A: 2
****
Q: Sentence: 'a triangular umbrella and a rectangular suitcase placed on either side of a circular wheel'. Find frequency of the letter 'u'

A:
5
****