instruction:
In this task, you need to count the number of times the given letter appears in the given sentence.
question:
Sentence: 'a gray airplane with metal petals on the wings takes off from an airport'. Find frequency of the letter 'i'
answer:
4


question:
Sentence: 'soccer players on opposite teams fight for control over a ball'. Find frequency of the letter 't'
answer:
4


question:
Sentence: 'a black and white photo of a person surfing. the picture is from underneath the water'. Find frequency of the letter 'h'
answer:

5