li = [8,3,7,2,3,9,4]

max_element = max(li)

min_element = min(li)

​

total = max_element - min_element

x = len(li)

for i in li:

    for j in range(x):

        if i - li[j] == total:

            print("buy price is=", li[j],"sell price is= ",i ,"the profit is ", i - li[j])