Input (grade 13): Annual rainfall is approximately 1100 m and in a normal year there are two distinct rainy seasons: "the long rains", which fall during April and May, and "the short rains", which fall during October and November.
Output (grade 4): Each year the area has two rainy seasons. These are called 'the long rains' (in April and May) and 'the short rains' (in October and November).