#include <bits/stdc++.h>
using namespace std;
int main() {
  string x;
  cin >> x;
  int c1 = 0, c0 = 0;
  bool f = 0;
  for (int i = 0; i < x.size(); i++) {
    if (x[i] == '0') {
      c0++;
    } else if (x[i] == '1') {
      c1++;
    }
    if (c0 < 7 && x[i] == '1') {
      c0 = 0;
    }
    if (c1 < 7 && x[i] == '0') {
      c1 = 0;
    }
  }
  if (c1 >= 7 || c0 >= 7) {
    cout << "YES" << endl;
  } else {
    cout << "NO" << endl;
  }
}
