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

[Q]: Sentence: 'a train is sitting at a train station'. Find frequency of the letter 'r'
[A]: 2


[Q]: Sentence: 'a commuter bus in england by a clock tower building'. Find frequency of the letter 'w'
[A]: 1


[Q]: Sentence: 'a man standing in front of a statue near a metal pole'. Find frequency of the letter 'f'
[A]:
2