#include <bits/stdc++.h>
using namespace std;
int main() {
  string s;
  cin >> s;
  int count = 1;
  bool res = false;
  for (int i = 0; i < s.length() - 1; i++) {
    if (s.at(i) == s.at(i + 1)) {
      count++;
      if (count > 6) {
        res = true;
        break;
      }
    } else {
      count = 1;
    }
  }
  if (res) {
    cout << "YES" << endl;
  } else {
    cout << "NO" << endl;
  }
  return 0;
}
