CF：96A.Football

#include<iostream>
#include<string>
using namespace std;
int main(){
    string str;
    while(cin>>str){
        int count=1;
        int t=1;
        for(int i=0;i<str.length();++i){
            if(str[i]==str[i+1])
                ++count;
            else {
                if(count>=7){
                    t=0;
                    break;
                }
                else
                    count=1;
            }

        }
        if(t)
            cout<<"NO"<<'\n';
        else
            cout<<"YES"<<'\n';
    }
    return 0;
}