footbal_96A.cpp

#include <iostream>
#include<string>
#include<algorithm>

using namespace std;

int main() {
  string s;
  cin >> s;
  
  int count = 1;
  int zcount = 1;
  int myone,myzero;
  for(int i = 0; i < s.length()-1; i++)
   {
       if(s[i] == '1' && s[i] == s[i+1])
        {
            count++;
            myone = count;
        }
        else if(s[i] == '0' && s[i] == s[i+1])
         {
             zcount++;
             myzero = zcount;
         }
        else
        {
            count = 1;
            zcount = 1;
        }
       
   }
    if(myone >=7 || myzero >=7) cout << "YES" << endl;
    else cout << "NO" << endl;
        
   return 0;
}