# coding: utf-8
# Your code here!

def target_index(l, x, default=999):
    if x in l:
        return l.index(x)
    else:
        return default
    
list_0 = input().split('.')
list_1 = input().split('.')

rel = []

for i in range(3):
    if int(list_0[i]) == int(list_1[i]):
        rel.append(0)
    elif int(list_0[i]) > int(list_1[i]):
        rel.append(-1)
    elif int(list_0[i]) < int(list_1[i]):
        rel.append(1)

judge_list = [i <= 0 for i in rel]

res = 0

# print('rel: {}'.format(rel))
# print('judge_list: {}'.format(judge_list))

if 1 not in rel:
    # print('passed1')
    res = 1
elif -1 not in rel:
    # print('passed2')
    if all(judge_list):
        res = 1
else:
    # print('passed3')
    if rel.index(-1) < rel.index(1):
        res = 1

if res == 1:
    print('YES')
else:
    print('NO')