Three prisoners are given a chance of escape, if they can win a logic game. Rules of the game are as follows.
The persons will be blindfolded and a red coloured or green coloured hat will be put on their head. After blindfold are removed they can see other two persons' hats, but not their own.They are not permitted to communicate with each other in any way; neither verbally nor by making any type of gestures. Immediately after blindfolds are removed, they are taken to three different rooms where each of them is required to write the colour of own hat, i. e. "Red" or "Green" on a plain paper. There is no way, that anyone of them could identify what others have written. They are permitted to devise a strategy, before they are blindfolded.

They will win if anyone amongst them can correctly identify the colour of his own hat. What strategy should they adopt to ensure 100% chance of the win.