Les7_1

[kostyria]

s = str(input(f'Введите одну строку без пробелов: '))
d = int(len(s))
poly = True
for i in range(d):
if s[i] == s[d-1]:
d -= 1
else:
poly = False
if poly is True:
print('yes')
else:
print('no')