#include<iostream>
#include<fstream>
#include<cstring>
#define DX 8080
using namespace std;
fstream fin("p1.in",ios::in);
char s[DX];
int main()
{
    int a,n,i,j,octet=0,masini=1,cerere=0,cars=0;
    fin>>s;
    n=strlen(s);
    for(i=0;i<n;i++)
    {
        a=0;
        if(s[i]=='1') a=1;
        if(masini==1 && a==0) cars++;
        if(masini==0 && a==0) cerere++;
        if(masini==1 && a==1)
        {
            if(cerere!=cars)
            {
                cout<<"NO\n";
                return 0;
            }
            masini=cerere=cars=octet=0;
        }
        if(masini==0) octet++;

        if(masini==0 && a==1) cerere=0;

        if(octet==8)
        {
            octet=0;
            masini=1;
        }
    }
    if(cerere!=cars)
    {
        cout<<"NO\n";
        return 0;
    }
    cout<<"YES\n";
    return 0;
}