How many two-digit natural numbers have the unit digit equal to 7 and are less than 50?
10 99 1 [OP_LIST_ARANGE] 1 7 [OP_LIST_SEARCH_FIXED_DIGIT] 50 [OP_LIST_LESS] [OP_LIST_LEN]
var_a = 10
var_b = 99
var_c = 1
list_a = [i for i in range(var_a, var_b + 1, var_c)]
var_d = 1
var_e = 7
list_b = [] 
var_d = int(var_d)
var_e = int(var_e)
for i in list_a:
    i = int(i)
    if (i//var_d)%10 == var_e:
        list_b.append(i)
var_f = 50
list_c = []
for i in list_b:
    if i < var_f:
        list_c.append(i)
var_g = len(list_c)
print(int(var_g))