#include
using namespace std;
class Game{
public:
        Game();
        int x_step();
        int y_step();
        bool valid(int step);
        bool win(int step);
private:
        bool ba,bb,bc,bd,be,bf,bg,bh,bi;
        char a,b,c,d,e,f,g,h,i;
        char syma,symb,symc;
        int z;    };    Game::Game(){z=1;}        int Game::x_step()
{
        int step;
        do{
                cout<<"X's input: ";
                cin>>step;
                if(step>10)cout<<"Invalid move."<9));
        return step;
}    int Game::y_step()
{
        int step;
        do{
                cout<<"O's input: ";
                cin>>step;
                if(step>10)cout<<"Invalid move."<9));
        return step;
}    bool Game::valid(int step)
{
        bool temp=false;
        switch(step)
        {
        case 1: temp=ba;break;
    case 2: temp=bb;break;
    case 3: temp=bc;break;
    case 4: temp=bd;break;
    case 5: temp=be;break;
    case 6: temp=bf;break;
    case 7: temp=bg;break;
    case 8: temp=bh;break;
    case 9: temp=bi;break;
        }
        return temp;
}    bool Game::win(int step)
{
        bool wi=false;
        int turn;
        turn=z%2;
        switch(step)
        {
        case 1:{if(turn ==0)a=symb;else a=symc;}ba=true;break;
    case 2:{if(turn ==0)b=symb;else b=symc;}bb=true;break;
    case 3:{if(turn ==0)c=symb;else c=symc;}bc=true;break;
    case 4:{if(turn ==0)d=symb;else d=symc;}bd=true;break;
    case 5:{if(turn ==0)e=symb;else e=symc;}be=true;break;
    case 6:{if(turn ==0)f=symb;else f=symc;}bf=true;break;
    case 7:{if(turn ==0)g=symb;else g=symc;}bg=true;break;
    case 8:{if(turn ==0)h=symb;else h=symc;}bh=true;break;
    case 9:{if(turn ==0)i=symb;else i=symc;}bi=true;break;
        }            cout<9 && !winner)cout<<"Fair game.";
        else if (((z-1)%2)==0) cout<<"O wins.";
        else if (((z-1)%2)!=0) cout<<"X wins.";
   return 0;        
}