Blinking LED for Diesel Generator

I need one small circuit which can be placed at the back of a switch board. The functionalities will be as follows.

1. There are 2 supply lines (220v), (A) and (B), where (A) is active in case when power supply is there OR diesel generator (DG) is running. B) is active in case when ONLY power supply is there.

2. One LED indicator (LED attached with resistance) will be there which will BLINK if generator is running, i.e. (A) is active and (B) is inactive, and will glow STEADY if generator is not running, i.e. both (A) and (B) is active.

It would be great if you can help me out.