题解

#include<iostream>
#include<cstring>
using namespace std;
int main(){
	string s;
	cin>>s;
	int sum=1;
	int len = s.length();
	for(int i=1;i<len;i++){
		if(s[i]==s[i-1]){
			sum++;
			if(sum>=7){
				cout<<"YES";
				return 0;
			}
		}else{
			sum=1;
		}
	}
	cout<<"NO";
	return 0;
}