def split_comma(i):
    s_i = i.split('.')
    a = [int(v) for v in s_i]
    return a

f = input()
a = split_comma(f)
g = input()
b = split_comma(g)
c = 100 * a[0] + 10 * a[1] + a[2]
d = 100 * b[0] + 10 * b[1] + b[2]
if c > d:
    print('YES')
else:
    print('NO')