pyhton中列表的实践操作编程问题

x=input()
a=x.split(' ')
b=0
c=0
de=0
for i in a:
    if int(i)<=35:
        b+=1
    elif int(i) in range(36,60):
        c+=1
    else:
        de+=1
print('less than and equal 35: %d'%b)
print('35 to 60: %d'%c)
print('bigger than and equal 60: %d'%de)