a,b,c=map(int,input().split("."))
x,y,z=map(int,input().split("."))
s,t="",""
for i in (a,b,c):
    i=f"{i:03d}"
    s+=str(i)
for j in (x,y,z):
    j=f"{j:03d}"
    t+=str(j)
# print(s,t)
if s>=t:print("YES")
elif s<t:print("NO")