import sys
read = sys.stdin.buffer.read
readline = sys.stdin.buffer.readline
readlines = sys.stdin.buffer.readlines

s = readline().decode().strip()
s2 = readline().decode().strip()

first = s.split(".")
f = [int(x) for x in first]
second = s2.split(".")
s = [int(x) for x in second]
if (s[0] < f[0] or (s[0] <= f[0] and s[1] < f[1]) or (s[0] <= f[0] and s[1] <= f[1] and s[2] <= f[2])):
    print("YES");
else :
    print("NO");