# -*- coding: utf-8 -*-

A = map(int, raw_input().split("."))
X = map(int, raw_input().split("."))

assert all(0 <= x <= 100 for x in A)
assert all(0 <= x <= 100 for x in X)

for i in xrange(3):
    if A[i] == X[i]:
        pass
    else:
        if A[i] < X[i]:
            print "NO"
        elif A[i] > X[i]:
            print "YES"
        break
else:
    print "YES"