#include <bits/stdc++.h>
using namespace std;
int main() {
  int c = 0;
  string s;
  cin >> s;
  for (int i = 0; i < s.size(); i++) {
    if (s[i] == s[i + 1]) {
      c++;
      if (c >= 6) break;
    } else if (s[i] != s[i + 1]) {
      c = 0;
    }
  }
  if (c >= 6) {
    cout << "YES" << endl;
  } else
    cout << "NO" << endl;
  return 0;
}
