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

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'
2

Sentence: 'a man and a woman are walking down the street with an umbrella over their heads'. Find frequency of the letter 'w'
4

Sentence: 'a cross walk with traffic cones at night'. Find frequency of the letter 'i'

3

