l = list(map(int, input().split(".")))
l1 = list(map(int, input().split(".")))

if l[0] > l1[0]:
    print("YES")
elif l[0] == l1[0]:
    if l[1] > l1[1]:
        print("YES")
    elif l[1] == l1[1]:
        if l[2] >= l1[2]:
            print ("YES")
        else:
            print ("NO")
    else:
        print ("NO")
else:
    print ("NO")