Ball Game

Two friends, Oj and Bhrigudov, play a very simple game. They have 2 bags in front of them - a red coloured and a blue coloured - each containing some marbles. The rules of the game are as follows : Oj starts first. They take alternate turns. In each turn they have to take out any number of marbles from exactly one of the bags. The player whose turn is the last turn of the game, i.e there are no ma