ΔΕΝ ΜΠΟΡΕΙΣ ΝΑ ΝΙΚΗΣΕΙΣ ΤΟΝ ΕΛΛΗΝΑ - YOU CAN'T BEAT A GREEK!!!‏

A Mathematician once asked the following question to a group of students from several countries :

How do you write 4 in between 5 ?

The Answers were as follows:

From China:

Is this a Joke?

From Japan:

Impossible!

From United States of America:

The question is wrong.

From United Kingdom:

Not found on Internet.

And.

From Greece:

 F(IV)E