n = input()
m = input()

n = n.split(".")
m = m.split(".")

if int(n[0]) < int(m[0]):
    print("NO")
elif int(n[0]) > int(m[0]):
    print("YES")
elif int(n[1]) < int(m[1]):
    print("NO")
elif int(n[1]) > int(m[1]):
    print("YES")
elif int(n[2]) < int(m[2]):
    print("NO")
elif int(n[2]) > int(m[2]):
    print("YES")
else:
    print("YES")