This is the Wikipedia definition of the children's game:
First a leader or "head of the line" is chosen, then the children all line up behind the leader. The leader then moves around and all the children have to mimic the leader's actions. Any players who mess up or do not do what the leader does are out of the game. The last person standing other than the leader is now the new leader.
So, who do you think the Lost leader will be at first? What do you think his or her actions will be? Who will not follow (And hence, be out of the game)? Who do you think the last person standing (aka the new leader) will be?