Find out how many three-digit numbers that are less than 900 and greater than 600 are composed of the three numbers 6, 4, and 9.
[OP_LIST_SOL] 6 4 9 [OP_LIST_EOL] 3 [OP_LIST_GET_PERM] 600 [OP_LIST_MORE] 900 [OP_LIST_LESS] [OP_LIST_LEN]
var_a = 6
var_b = 4
var_c = 9
list_a= []
if "/" in str(var_c):
    var_c = eval(str(var_c))
list_a.append(var_c)
if "/" in str(var_b):
    var_b = eval(str(var_b))
list_a.append(var_b)
if "/" in str(var_a):
    var_a = eval(str(var_a))
list_a.append(var_a)
list_a.reverse()
var_d = 3
list_b = [str(i) for i in list_a]
list_b = list(itertools.permutations(list_b, var_d))
list_b = [''.join(num_list) for num_list in list_b]
list_b = [str_num for str_num in list_b if str_num[0] != '0']
list_b = [float(i) for i in list_b]
var_e = 600
list_c = []
for i in list_b:
    if i > var_e:
        list_c.append(i)
var_f = 900
list_d = []
for i in list_c:
    if i < var_f:
        list_d.append(i)
var_g = len(list_d)
print(int(var_g))