instruction:
In this task, you need to count the number of times the given letter appears in the given sentence.
question:
Sentence: 'a downhill skier with snow plumes behind them'. Find frequency of the letter 'i'
answer:
4


question:
Sentence: 'a plastic plastic plate topped with three different type of food'. Find frequency of the letter 'l'
answer:
3


question:
Sentence: 'the tower of the building has a clock displayed on it'. Find frequency of the letter 'w'
answer:

1