list0 = input().split(".")
list1 = input().split(".")

flag = ""
if list0[0] < list1[0]:
    flag = "NO"
elif list0[0] == list1[0]:
    flag = ""
else:
    flag = "YES"

if flag == "":
    if list0[1] < list1[1]:
        flag = "NO"
    elif list0[1] == list1[1]:
        flag = ""
    else:
        flag = "YES"

if flag == "":
    if list0[2] < list1[2]:
        flag = "NO"
    elif list0[2] == list1[2]:
        flag = ""
    else:
        flag = "YES"

print(flag)