Classify the cities based on whether they are located in Eritrea or Gabon.
Keren, Franceville, Asmara, Port-Gentil, Assab, Libreville
Eritrea - Asmara, Keren, Assab
Gabon - Libreville, Port-Gentil, Franceville
Below is an instruction that describes a task, paired with an input that provides further context. Write a response that appropriately completes the request.
### Instruction: Classify the cities based on whether they are located in Eritrea or Gabon.
Keren, Franceville, Asmara, Port-Gentil, Assab, Libreville
### Input: 
### Response: Eritrea - Asmara, Keren, Assab
Gabon - Libreville, Port-Gentil, Franceville