import java.util.Scanner;
 
public class Main{
    public static void main(String[] args){
        Scanner sc = new Scanner(System.in);
        String rs = sc.next();
        int c=1, max=0;
        for(int i=0;i<rs.length();i++){
            if(i<rs.length()-1 && rs.charAt(i) == rs.charAt(i+1)){
                c++;
            }else{
                if(c>max)
                    max = c;
                c=1;
            }
        }
        System.out.println(max+" c:"+c);
        System.out.println((max>=7)?"YES":"NO");
    }
}

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00100110111111101