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 (GCC 5.4.1) (judge verdict: Runtime Error)

#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <stdint.h> // int64_t

#define max(a,b) ((a) > (b) ? (a) : (b))
#define min(a,b) ((a) > (b) ? (b) : (a))

int get_int(void) {
  int num;
  scanf("%d", &num);
  return num;
}

int get_int2(int *a1, int *a2) {
  scanf("%d %d", a1, a2);
  return 0;
}


#define VERTEX_MAX 100000
#define EDGE_MAX 100000
struct list {
    struct list *next;
    int dst;
};

struct list *create_graph(int vs) {
    static struct list graph[VERTEX_MAX];
    int i;
    for(i = 0; i < vs; i++) {
        graph[i].next = &graph[i];
    }
    return graph;
}

struct list lpool[EDGE_MAX];
int lidx = 0;

void add_list(struct list *head, int v) {
    struct list *elem = &lpool[lidx++];
    elem->dst = v;
    elem->next = head->next;
    head->next = elem;
}

void get_dist(struct list *graph, int node, int parent, int *out) {
    if(parent == -1) {
        out[node] = 0;
    } else {
        out[node] = out[parent]+1;
    }
    struct list *elem;
    struct list *head = &graph[node];
    for(elem = head->next; elem != head; elem = elem->next) {
        if(elem->dst == parent) continue;
        get_dist(graph, elem->dst, node, out);
    }
    return;
}

int get_count(struct list *graph, int node, int parent) {
    int ans = 1;
    struct list *elem;
    struct list *head = &graph[node];
    for(elem = head->next; elem != head; elem = elem->next) {
        if(elem->dst == parent) continue;
        ans += get_count(graph, elem->dst, node);
    }
    return ans;
}


int main(void) {
    int num = get_int();
    struct list *graph = create_graph(num);
    int i;
    for(i = 0; i < num-1; i++) {
        int v1, v2;
        get_int2(&v1, &v2);
        v1--; v2--;
        add_list(&graph[v1], v2);
        add_list(&graph[v2], v1);
    }

    static int aout[VERTEX_MAX];
    static int bout[VERTEX_MAX];
    get_dist(graph, 0, -1, aout);
    get_dist(graph, num-1, -1, bout);

    int root = 0;
    // 0: 1-st, 1: 2nd
    int next_turn = 0;
    int sum = VERTEX_MAX*2;
    for(i = 0; i < num; i++) {
#ifdef DEBUG
        printf("%d -> %d : %d\n", i, aout[i], bout[i]);
#endif
        int diff = bout[i] - aout[i];
        if(sum >= aout[i]+bout[i]) {
            if(diff >= 0 && diff <= 1) {
                next_turn = (1-diff);
                root = i;
                sum = aout[i]+bout[i];
            }
            if(diff == 0) break;
        }
    }
#ifdef DEBUG
    printf("root: %d -> next: %d\n", root, next_turn);
#endif
    struct list *elem;
    struct list *head = &graph[root];
    static int blacks, whites;
    int flag = 1;
    if(aout[root] == 0) { goto finish; }
    for(elem = head->next; elem != head; elem=elem->next) {
        if(next_turn==0) {
            if(aout[root] > aout[elem->dst]) {
                blacks = get_count(graph, elem->dst, root);
                whites = num-blacks;
            }
        } else {
            if(bout[root] > bout[elem->dst]) {
                whites = get_count(graph, elem->dst, root);
                blacks = num-whites;
            }
        }
        flag = (blacks <= whites);
    }
#ifdef DEBUG
    printf("[next: %d] %d vs %d\n", next_turn, blacks, whites);
#endif
finish:
    printf("%s\n", flag ? "Snuke" : "Fennec");
    return 0;
}