s = input().split('.')
t = input().split('.')

s = list(map(int,s))
t = list(map(int,t))

# print(s)
# print(t)

s = s[0] * 10201 + s[1]*101 + s[2]
t = t[0] * 10201 + t[1]*101 + t[2]

if t <= s:
    print('YES')
else:
    print('NO')