int DelDigNfromA(int a,int n)
{
    if(a<=0||n<=0) return -1;
    int kcf=Kc(a);
    int t=kcf-n+1;
    int m=0,d=1,k=0;
    do
    {
        int c=a%10;
        k++;
        if(k!=t)
        {
            m=m+c*d; d=d*10;
        }
        a=a/10;
    }while(a!=0);
    return m;
}