Analog & digital pins can all be used as digital pins.
D0-D13 are digital (leave D0, D1 free for serial interfacing),
A0-A5 are addressed digitally as D14-D19.
Get yourself 14 resistors, 220 ohm should be okay, connect them from D2 -D15 to the anode pins of the displays.
Cathode will go to ground as stated earlier.