#include <iostream> #include <string> #include <cassert> using namespace std; using ll = long long; template<class T> inline bool chmax(T& a, const T& b) {if (a<b) {a=b; return true;} return false;} template<class T> inline bool chmin(T& a, const T& b) {if (b<a) {a=b; return true;} return false;} const int INTINF = 1000001000; const int INTMAX = 2147483647; const ll LLMAX = 9223372036854775807; const ll LLINF = 1000000000000000000; int main() { ios::sync_with_stdio(0); cin.tie(0); cout.tie(0); int N; cin >> N; string S; cin >> S; for (int i=0; i+2<N; i++) { if (S.substr(i,3) == "404") { cout << "Found\n"; return 0; } } cout << "NotFound\n"; return 0; }