Codeforces_96A

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

int main()
{
string z_o;
int Count, length, Max;
char cur;
while(cin >> z_o)
{
length = z_o.size();
cur = z_o[0];
Max = Count = 1;
for(int i = 1; i < length; i++)
{
if(z_o[i] == cur)
Count++;
else
{
cur = z_o[i];
Count = 1;
}
if(Count > Max)
Max = Count;
}
if(Max >= 7)
cout << "YES" << endl;
else
cout << "NO" << endl;
}
return 0;
}