#include<bits/stdc++.h>
#define int long long
using namespace std;
int32_t main()
{
int t=1;
// cin>>t;
while(t--)
{
string s;
cin>>s;
int x=s.size();
for(int i=0;i<x-6;i++)
{
int cn=0;
for(int j=0;j<7;j++)
{
if(s[i]==s[i+j])
cn++;
if(cn==7)
{
cout<<"YES";
return 0;
}
}
}
cout<<"NO";
}
return 0;
}
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