a=input().split(".")
b=input().split(".")
n1=int(a[0])*1000000+int(a[1])*1000+int(a[2])
n2=int(b[0])*1000000+int(b[1])*1000+int(b[2])
if n1-n2>=0:
    print("YES")
else:
    print("NO")