题解 | #自守数#
自守数
https://www.nowcoder.com/practice/88ddd31618f04514ae3a689e83f3ab8e
num = int(input())
count = 0
for i in range(num+1):
pinfang = i ** 2
str_pinfang = str(pinfang)
str_i = str(i)
if str_pinfang[-len(str_i):] == str_i:
count += 1
print(count)
