this is my solution



#include<iostream>
using namespace std;
int main()
{
    int n,a,b,c,d,s1=0,s2=0;
    cin>>n;
    a=n;

    n=a+1;
    s1+=n%10;n=n/10;
    s1+=n%10;
    n=n/10;
    s1+=n%10;n=n/10;

    s2+=n%10;n=n/10;
    s2+=n%10;n=n/10;
    s2+=n%10;n=n/10;
    if(s1==s2)b=1;
n=a-1;s1=0;s2=0;

if(n==1)    cout<<"YES";
else {
s1+=n%10;n=n/10;
    s1+=n%10;
    n=n/10;
    s1+=n%10;n=n/10;

    s2+=n%10;n=n/10;
    s2+=n%10;n=n/10;
    s2+=n%10;n=n/10;
    if(s1==s2)b=1;
}
if(b==1)cout<<"YES";
else cout<<"NO";


}