I assume you mean hedge. Leylandii are quick. though if you want a deciduous hedge then beech is quite quick and makes a good screen.

Ulmus pumila - I have seen that advertised as a great hedging plant. I can't say either way as I have not personally used it but Photonia red robin is a great hedging and screening plant. Ulmus will be deciduous, so you will lose the screen in winter. I would avoid Leylandii unless you keep it pruned. They look fine kept to a large hedge but you need to keep pruning as they want to grow large (80-90 foot!) and it will look awful if left to grow that height and make your home unsaleable.

I don't want to tread on your toes, SBG, but we once had a beech hedge, and it was a darned nuisance. It looks amazing in Springtime with it's lovely silky new leaves, but the old ones cling and can look very untidy the rest of the time. Don't go down the Leylandii path - more trouble than they are worth. I'd go with Photinia, too, personally - beautiful plant.

Photinia Robinia is beautiful, but don't trim it all at once.Just clip out some of the leaves which are turning green,and the new growth will come red. We do this and we always have some colour.

It would also be nice to know where in the world Milica is. What works in Scotland wouldn't necessarily work in Iran, or in my neck of the woods, either!