96A. Football.cpp

#include <iostream>
#include <string>
using namespace std;

int main() {
	string s;
	cin >> s;
	s += ' ';
	int count = 0;
	
	for(int i = 0; i < s.length(); i++) {
		if(s[i] == s[i+1])
			count++;
		else
			count = 0;
			
		if(count >= 6) {
			cout << "YES" << endl;
			return 0;
		}
	}
	
	cout << "NO" << endl;
	
	return 0;
}