Seven men A,B, C, D, E, F, G are standing in a queue in that order. Each one is wearing a cap of different colour like violet, indigo, blue, green, yellow, orange and red.D is able to see in front of him green and blue, but not violet. E can see violet and yellow but not red. G can see caps of all colours other than orange. If E is wearing an indigo coloured cap, then the colour of the cap worn by F is