old_version = list(map(int, (input().split('.'))))

check_version = list(map(int, (input().split('.'))))

flag = 0

for i in range(3):
    if int(old_version[i]) > int(check_version[i]):
        flag = 1
        print('YES')
        break
    elif int(old_version[i] < int(check_version[i])):
        flag = 1
        print('NO')
        break

if flag == 0:
    print('YES')