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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;
}