连续出现的字符

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#include<iostream>
#include<string>
using namespace std;
string s;
int main()
{
	int n;
	cin >> n; cin.ignore();
	getline(cin, s);
	int len = s.length();
	int cnt = 1;
	for (int i = 1; i < len; i++)
	{
		if (s[i] == s[i - 1])
		{
			cnt++;
			if (cnt >= n)
			{
				cout << s[i];
				return 0;
			}
		}
		else 
		{
			cnt = 1;
		}
	}
	cout << "no" << endl;
	return 0;
}