void printBoard(string &board)
{
cout<<board[1]<<"|"<<board[2]<<"|"<<board[3]<<endl;
cout<<"------"<<endl;
cout<<board[4]<<"|"<<board[5]<<"|"<<board[6]<<endl;
cout<<"------"<<endl;
cout<<board[7]<<"|"<<board[8]<<"|"<<board[9]<<endl;	
}