ISA Brown hen or rooster?

[Nateloos8]

I have 4 ISA Browns I am confused if I have 3 hens and a rooster or 3 roosters and 1 Hen 3/4 have the same tail feathers and all look the same except for the 1 with the different tail feathers I am new to this

 

[JedJackson]

All females. Male ISA browns are mostly white, with a small amount of red at the shoulders.