The capital letters of the modern greek alphabet is almost the same as lonic alphabet. Lower case letters came to be in after 800 AD. People would usually write horizontal lines and write, right to left. In 500 bc changed the direction of writing to horizontal lines from left to right.
Let me hear you say GO GREEK. Let me hear you say GO GREEK. Let me hear you say alpha beta gamma delta epsilon zeta eta theta iota kappa lambda mu nu xi omicron pi rho sigma tau upsilon PHI CHI PSI OMEGA!