In this task, you need to count the number of times the given letter appears in the given sentence.
--------
Question: Sentence: 'two giraffes standing next to some trees'. Find frequency of the letter 'f'

Answer: 2


Question: Sentence: 'two people and two children walking in a building'. Find frequency of the letter 'd'

Answer: 3


Question: Sentence: 'a giraffe standing in the brush on the plains'. Find frequency of the letter 'u'

Answer:
1