list_0 = input().split('.')
list_1 = input().split('.')

rel = []

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

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

if all(judge_list) or rel.index(-1) == 0:
    res = 1
else:
    res = 0
    
if res == 1:
    print('YES')
else:
    print('NO')