from os import system
system("cls")
n = 10
a = []
sum = 0
count = 0
for i in range(n):
a.append(int(input("Введите число >> ")))
for s in range(len(a)):
if a[s] > 9 and a[s] < 99:
sum += a[s]
count += 1
sr = sum/10
if count > 0:
print("Среднее значение 2-х - ", sr)
else:
print("Нет")