if(x==1 && x1!='X' && x1!='O')if(a%2==0)x1='X', a++, i++;
else x1='O', a++, i++;
if(x==2 && x2!='X' && x2!='O')if(a%2==0)x2='X', a++, i++;
else x2='O', a++, i++;
if(x==3 && x3!='X' && x3!='O')if(a%2==0)x3='X', a++, i++;
else x3='O', a++, i++;
if(x==4 && x4!='X' && x4!='O')if(a%2==0)x4='X', a++, i++;
else x4='O', a++, i++;
if(x==5 && x5!='X' && x5!='O')if(a%2==0)x5='X', a++, i++;