month_number = {
	'Jan':1,
	'Feb':2,
	'Mar':3,
	1:'Jan',
	2:'Feb',
	3:'Mar'
}
print(month_number)

month_list = [1,2,3]
print(month_list[1])
print(month_number[2])

month_number['Apr'] = 4
print(month_number)
print("====================================================")
print(month_number.keys())