using System;

class Program
{
    static void Main()
    {
        string s = Console.ReadLine();
        string[] t1 = s.Split('0');
        string[] t2 = s.Split('1');

        for (int i = 0; i < t1.Length; i++)
        {
           if (t1[i].Length >= 7)
            {
                Console.WriteLine("YES");
                return;
            }
        }
        for (int i = 0; i < t2.Length; i++)
        {
            if (t2[i].Length >= 7)
            {
                Console.WriteLine("YES");
                return;
            }
        }
        Console.WriteLine("NO");

    }
}