Problem:
Score : 400 points

Problem Statement

Fennec and Snuke are playing a board game.

On the board, there are N cells numbered 1 through N, and N-1 roads, each connecting two cells. Cell a_i is adjacent to Cell b_i through the i-th road. Every cell can be reached from every other cell by repeatedly traveling to an adjacent cell. In terms of graph theory, the graph formed by the cells and the roads is a tree.

Initially, Cell 1 is painted black, and Cell N is painted white. The other cells are not yet colored.
Fennec (who goes first) and Snuke (who goes second) alternately paint an uncolored cell.
More specifically, each player performs the following action in her/his turn:

Fennec: selects an uncolored cell that is adjacent to a black cell, and paints it black.

Snuke: selects an uncolored cell that is adjacent to a white cell, and paints it white.

A player loses when she/he cannot paint a cell. Determine the winner of the game when Fennec and Snuke play optimally.

Constraints

2 \leq N \leq 10^5

1 \leq a_i, b_i \leq N

The given graph is a tree.

Input

Input is given from Standard Input in the following format:

N
a_1 b_1
:
a_{N-1} b_{N-1}

Output

If Fennec wins, print Fennec; if Snuke wins, print Snuke.

Sample Input 1

7
3 6
1 2
3 1
7 4
5 7
1 4

Sample Output 1

Fennec

For example, if Fennec first paints Cell 2 black, she will win regardless of Snuke's moves.

Sample Input 2

4
1 4
4 2
2 3

Sample Output 2

Snuke

Solution in C# (Mono 4.6.2.0) (judge verdict: Wrong Answer)

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace CS_AtCoder {
	class Program {
		static void Main(string[] args) {
			new Calc().Solve();
		}
	}
	public class Calc {
		Scan cin = new Scan();
		List<List<int>> graph = new List<List<int>>();
		List<bool> visited;
		int N;

		public void Solve() {
			N = cin.ReadInt();
			for (int i = 0; i < N; i++) { graph.Add(new List<int>()); }
			for (int i = 0; i < N - 1; i++) {
				var ab = cin.ReadInt(' ').Select(x => x - 1).ToArray();
				int a = ab[0], b = ab[1];
				graph[a].Add(b);
				graph[b].Add(a);
			}
			visited = Enumerable.Repeat(false, N).ToList();
			toSnuke(0, 0, 0);
			visited = visited.Select(x => { return false; }).ToList();
			CountIgnore(N-1);
			SnukeLengthTo--;
			int F_Node = N - SnukeLengthTo - SnukeNodes;
			if (F_Node == SnukeNodes) {
				(SnukeLengthTo % 2 == 1 ? "Fennec" : "Snuke").WL();
			} else {
				(F_Node > SnukeNodes ? "Fennec" : "Snuke").WL();
			}
			return;
		}
		private int SnukeLengthTo = 0;
		private int NextSnukeNode = 0;
		void toSnuke(int sum,int from,int current) {
			if (current == N - 1) { NextSnukeNode = from; SnukeLengthTo = sum; return; }
			if (visited[current]) return;
			visited[current] = true;
			for (int i = 0; i < graph[current].Count; i++) {
				toSnuke(sum+1,current,graph[current][i]);
			}
		}
		int SnukeNodes = 0;
		void CountIgnore(int current) {
			if (current == NextSnukeNode) return;
			if (visited[current]) return;
			visited[current] = true;
			SnukeNodes++;
			for (int i = 0; i < graph[current].Count; i++) {
				CountIgnore(graph[current][i]);
			}
		}

	}

	public class Scan {
		public Scan() { }
		public int ReadInt() => int.Parse(Console.ReadLine());
		public int[] ReadInt(char separator) => Console.ReadLine().Split(separator).Select(int.Parse).ToArray();
		public double ReadDouble() => double.Parse(Console.ReadLine());
		public double[] ReadDouble(char separator) => Console.ReadLine().Split(separator).Select(double.Parse).ToArray();
		public long ReadLong() => long.Parse(Console.ReadLine());
		public long[] ReadLong(char separator) => Console.ReadLine().Split(separator).Select(long.Parse).ToArray();
		public string ReadLine() => Console.ReadLine();
		public string[] ReadLine(char separator) => Console.ReadLine().Split(separator).ToArray();
	}
	public static class Utils {
		public static string Docking<T>(this IEnumerable<T> collection,Func<T,string> filter = null) {
			StringBuilder sb = new StringBuilder();
			long Length = collection.Count();
			foreach (var item in collection.Select((v, i) => new { V = v, I = i })) {
				sb.Append(filter != null ? filter(item.V) : item.V.ToString());
			}
			return sb.ToString();
		}
		public static void WL(this object obj) => Console.WriteLine(obj);
		public static int IntParse(this string s) => int.Parse(s);
		public static int IntParse(this char c) => c - '0';
		public static List<int> SieveOfEratosthenes(int max) {
			int prime;
			double sqMax = Math.Sqrt(max);
			var prList = new List<int>();
			var srList = new List<int>();
			for (int i = 2; i < max+1; i++) {
				srList.Add(i);
			}
			do {
				prime = srList[0];
				prList.Add(prime);
				srList.RemoveAll(x => x % prime == 0);
			} while (prime<sqMax);
			prList.AddRange(srList);
			return prList;
		}
		public static long NCR(int n,int r) {
			long p = 1;
			for (int i = 1; i <=r; i++) {
				p = p * (n - i + 1) / i;
			}
			return p;
		}
	}
}