ACMP_164

#include <iostream>
#include <cstdio>
#include <cstdlib>
#include <string>
#include <sstream>
#define F(i,a,b) for (int i=a; i<=b; i++)
#define Ss stringstream
#define L length()
using namespace std;
string st;

      int go(int z)
       {
        int tp=0;
        while (z)
         {
          tp+=(z%10); z/=10;
         }
         if (tp>9) go(tp); else return tp;
       }

    bool c(int k)
     {
      int x=0,y=0;
      string s1,s2;
      F(i,0,k-1) s1+=st[i];
      F(i,k,st.L-1) s2+=st[i];
      Ss(s1)>>x; Ss(s2)>>y;
      x=go(x); y=go(y);
      cout<<x<<" "<<y<<endl;

      if (x==y) return 1; else
      return 0;
     }

int main()
{
 freopen("input.txt","rt",stdin);
 freopen("output.txt","wt",stdout);
 cin>>st;
  F(i,1,st.L-1)
  if (c(i)) cout<<"YES",exit(0);
 cout<<"NO";
}