Q3(cyclesheet 6)

def student_marks(a):
    mean = 0
    exact_mean = []
    above_mean = []
    below_mean = []
    for key in a:
        mean= mean + a[key]
    mean = (int)(mean/len(a))
    for key in a:
        if (a[key]==mean):
            exact_mean.append(key)
        elif (a[key]>mean):
            above_mean.append(key)
        else:
            below_mean.append(key)
    for i in exact_mean:
        if i != None:
            print(i)
    for i in above_mean:
        if i != None:
            print(i)
    for i in below_mean:
        if i != None:
            print(i)
marks = eval(input())
student_marks(marks)