#include <bits/stdc++.h>
using namespace std;
int main() {
  string s;
  int i, count1 = 0, count = 0;
  cin >> s;
  for (i = 0; i < s.length(); i++) {
    if (s[i] == '1') {
      count++;
      count1 = 0;
      if (count == 7) {
        cout << "YES";
        return 0;
      }
    } else {
      count = 0;
      count1++;
      if (count1 == 7) {
        cout << "YES";
        return 0;
      }
    }
  }
  cout << "NO";
  return 0;
}
