int main ()
{
    int i=3;
    int j=3;   //i+j=???m
    int l1=2;
    int l2=2;
    int m,n,k; //n???????????????,k?????????????
    char a='y'; //????????????????????????????
    cin>>m;
    n=m/2;
    for (i=3;i<=n;i++)              
    {
        a='y';
        j=m-i;
        k=sqrt(i);   
        for (l1=2;l1<=k;l1++)
        {
            if (i%l1==0)           
                a='n';   
        }                      //?????i?????
        k=sqrt(j);
        for (l2=2;l2<=k;l2++)
        {
            if (j%l2==0)
                a='n';
        }                      //?????j?????
        if (a=='y')
          cout<<i<<' '<<j<<endl;   
    }   
    return 0;           
}
