Codeforces_96A

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#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;
}