Python Awesome !!!!!!!!!!! 
def lac_lu(array):
    a = sorted(array)
    for i in range(0,len(a)):
        if i % 2 == 0:
            print a[i]
        else :
            print a[len(a)-i]

L =[1, 2, 3, 4,5,8,3,2,1,9]

lac_lu_2 = lambda L: sorted(L)

print lac_lu_2(L)