96A - Football

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

int main() {
    char n,prev;
    int dan=0,p=0;
    cin>>prev;

    p=1;
    while(cin>>n){
        if (prev==n)
            p++;
        else
            p=1;
        if (p==7){
            dan=1;
            break;
        }
        prev=n;
    }
    if (dan)
        cout<<"YES"<<endl;
    else
        cout<<"NO"<<endl;
}