Buggy python submission (verdict: Time Limit Exceeded):
def getN():
    return int(input())
def getNM():
    return map(int, input().split())
def getList():
    return list(map(int, input().split()))
def getArray(intn):
    return [int(input()) for i in range(intn)]
def input():
    return sys.stdin.readline().rstrip()
def rand_N(ran1, ran2):
    return random.randint(ran1, ran2)
def rand_List(ran1, ran2, rantime):
    return [random.randint(ran1, ran2) for i in range(rantime)]
def rand_ints_nodup(ran1, ran2, rantime):
  ns = []
  while len(ns) < rantime:
    n = random.randint(ran1, ran2)
    if not n in ns:
      ns.append(n)
  return sorted(ns)

def rand_query(ran1, ran2, rantime):
  r_query = []
  while len(r_query) < rantime:
    n_q = rand_ints_nodup(ran1, ran2, 2)
    if not n_q in r_query:
      r_query.append(n_q)
  return sorted(r_query)

from collections import defaultdict, deque, Counter
from sys import exit
from decimal import *
import heapq
import math
from fractions import gcd
import random
import string
import copy
from itertools import combinations, permutations, product
from operator import mul
from functools import reduce
from bisect import bisect_left, bisect_right

import sys
sys.setrecursionlimit(1000000000)
mod = 10 ** 9 + 7


#############
# Main Code #
#############

N = getN()
query = [getList() for i in range(N - 1)]

dist = [[] for i in range(N)]
for i in range(N - 1):
    a, b = query[i]
    dist[a - 1].append(b - 1)
    dist[b - 1].append(a - 1)

ignore = [0] * N
route = []

# nowからNまでのルート
def bfs(now, goal, array):
    pos = deque([[now, array]])

    while pos[0][0] != goal:
        u, arr = pos.popleft()
        ignore[u] = 1

        for i in dist[u]:
            if ignore[i] != 1:
                newarray = copy.deepcopy(arr)
                newarray.append(i)
                pos.append([i, newarray])

    return pos[0][1]

# NG以外のところで辿れるところの数
def dfs_ter(sta, ng):
    pos = deque([sta])

    ignore = [0] * N
    for i in ng:
        ignore[i] = 1

    cnt = 0
    while len(pos) > 0:
        u = pos.popleft()
        ignore[u] = 1
        cnt += 1
        for i in dist[u]:
            if ignore[i] != 1:
                pos.append(i)

    return cnt

# ルート探索
route = bfs(0, N - 1, [0])

L = len(route)
fen_ter = route[:(L + 2 - 1) // 2]
snu_ter = route[(L + 2 - 1) // 2:]

fen_ans = dfs_ter(0, snu_ter)

if fen_ans > N - fen_ans:
    print('Fennec')
else:
    print('Snuke')

Fixed submission:
def getN():
    return int(input())
def getNM():
    return map(int, input().split())
def getList():
    return list(map(int, input().split()))
def getArray(intn):
    return [int(input()) for i in range(intn)]
def input():
    return sys.stdin.readline().rstrip()
def rand_N(ran1, ran2):
    return random.randint(ran1, ran2)
def rand_List(ran1, ran2, rantime):
    return [random.randint(ran1, ran2) for i in range(rantime)]
def rand_ints_nodup(ran1, ran2, rantime):
  ns = []
  while len(ns) < rantime:
    n = random.randint(ran1, ran2)
    if not n in ns:
      ns.append(n)
  return sorted(ns)

def rand_query(ran1, ran2, rantime):
  r_query = []
  while len(r_query) < rantime:
    n_q = rand_ints_nodup(ran1, ran2, 2)
    if not n_q in r_query:
      r_query.append(n_q)
  return sorted(r_query)

from collections import defaultdict, deque, Counter
from sys import exit
from decimal import *
import heapq
import math
from fractions import gcd
import random
import string
import copy
from itertools import combinations, permutations, product
from operator import mul
from functools import reduce
from bisect import bisect_left, bisect_right

import sys
sys.setrecursionlimit(1000000000)
mod = 10 ** 9 + 7


#############
# Main Code #
#############

N = getN()
query = [getList() for i in range(N - 1)]

dist = [[] for i in range(N)]
for i in range(N - 1):
    a, b = query[i]
    dist[a - 1].append(b - 1)
    dist[b - 1].append(a - 1)

# nowからNまでのルート
def router(n, sta, end):
    pos = deque([sta])
    ignore = [0] * n
    path = [0] * n
    path[sta] = -1

    while pos[0] != end:
        u = pos.popleft()
        ignore[u] = 1

        for i in dist[u]:
            if ignore[i] != 1:
                path[i] = u
                pos.append(i)

    route = deque([end])
    while True:
        next = path[route[0]]
        route.appendleft(next)
        if route[0] == sta:
            break

    return list(route)

route = router(N, 0, N - 1)

# NG以外のところで辿れるところの数
def dfs_ter(sta, ng):
    pos = deque([sta])

    ignore = [0] * N
    for i in ng:
        ignore[i] = 1

    cnt = 0
    while len(pos) > 0:
        u = pos.popleft()
        ignore[u] = 1
        cnt += 1
        for i in dist[u]:
            if ignore[i] != 1:
                pos.append(i)

    return cnt

L = len(route)
fen_ter = route[:(L + 2 - 1) // 2]
snu_ter = route[(L + 2 - 1) // 2:]

fen_ans = dfs_ter(0, snu_ter)

if fen_ans > N - fen_ans:
    print('Fennec')
else:
    print('Snuke')

Buggy python submission (verdict: Time Limit Exceeded):
def getN():
    return int(input())
def getNM():
    return map(int, input().split())
def getList():
    return list(map(int, input().split()))
def getArray(intn):
    return [int(input()) for i in range(intn)]
def input():
    return sys.stdin.readline().rstrip()
def rand_N(ran1, ran2):
    return random.randint(ran1, ran2)
def rand_List(ran1, ran2, rantime):
    return [random.randint(ran1, ran2) for i in range(rantime)]
def rand_ints_nodup(ran1, ran2, rantime):
  ns = []
  while len(ns) < rantime:
    n = random.randint(ran1, ran2)
    if not n in ns:
      ns.append(n)
  return sorted(ns)

def rand_query(ran1, ran2, rantime):
  r_query = []
  while len(r_query) < rantime:
    n_q = rand_ints_nodup(ran1, ran2, 2)
    if not n_q in r_query:
      r_query.append(n_q)
  return sorted(r_query)

from collections import defaultdict, deque, Counter
from sys import exit
from decimal import *
import heapq
import math
from fractions import gcd
import random
import string
import copy
from itertools import combinations, permutations, product
from operator import mul
from functools import reduce
from bisect import bisect_left, bisect_right

import sys
sys.setrecursionlimit(1000000000)
mod = 10 ** 9 + 7


#############
# Main Code #
#############

N = getN()
query = [getList() for i in range(N - 1)]

dist = [[] for i in range(N)]
for i in range(N - 1):
    a, b = query[i]
    dist[a - 1].append(b - 1)
    dist[b - 1].append(a - 1)

ignore = [0] * N
route = []

# nowからNまでのルート
def dfs(now, goal, array):
    pos = deque([[now, array]])

    while pos[0][0] != goal:
        u, arr = pos.popleft()
        ignore[u] = 1

        for i in dist[u]:
            if ignore[i] != 1:
                newarray = copy.deepcopy(arr)
                newarray.append(i)
                pos.append([i, newarray])

    return pos[0][1]

# NG以外のところで辿れるところの数
def dfs_ter(sta, ng):
    pos = deque([sta])

    ignore = [0] * N
    for i in ng:
        ignore[i] = 1

    cnt = 0
    while len(pos) > 0:
        u = pos.popleft()
        ignore[u] = 1
        cnt += 1
        for i in dist[u]:
            if ignore[i] != 1:
                pos.append(i)

    return cnt

# ルート探索
route = dfs(0, N - 1, [0])

L = len(route)
fen_ter = route[:(L + 2 - 1) // 2]
snu_ter = route[(L + 2 - 1) // 2:]

fen_ans = dfs_ter(0, snu_ter)
snu_ans = dfs_ter(N - 1, fen_ter)

if snu_ans >= fen_ans:
    print('Snuke')
else:
    print('Fennec')

Fixed submission:
def getN():
    return int(input())
def getNM():
    return map(int, input().split())
def getList():
    return list(map(int, input().split()))
def getArray(intn):
    return [int(input()) for i in range(intn)]
def input():
    return sys.stdin.readline().rstrip()
def rand_N(ran1, ran2):
    return random.randint(ran1, ran2)
def rand_List(ran1, ran2, rantime):
    return [random.randint(ran1, ran2) for i in range(rantime)]
def rand_ints_nodup(ran1, ran2, rantime):
  ns = []
  while len(ns) < rantime:
    n = random.randint(ran1, ran2)
    if not n in ns:
      ns.append(n)
  return sorted(ns)

def rand_query(ran1, ran2, rantime):
  r_query = []
  while len(r_query) < rantime:
    n_q = rand_ints_nodup(ran1, ran2, 2)
    if not n_q in r_query:
      r_query.append(n_q)
  return sorted(r_query)

from collections import defaultdict, deque, Counter
from sys import exit
from decimal import *
import heapq
import math
from fractions import gcd
import random
import string
import copy
from itertools import combinations, permutations, product
from operator import mul
from functools import reduce
from bisect import bisect_left, bisect_right

import sys
sys.setrecursionlimit(1000000000)
mod = 10 ** 9 + 7


#############
# Main Code #
#############

N = getN()
query = [getList() for i in range(N - 1)]

dist = [[] for i in range(N)]
for i in range(N - 1):
    a, b = query[i]
    dist[a - 1].append(b - 1)
    dist[b - 1].append(a - 1)

# nowからNまでのルート
def router(n, sta, end):
    pos = deque([sta])
    ignore = [0] * n
    path = [0] * n
    path[sta] = -1

    while pos[0] != end:
        u = pos.popleft()
        ignore[u] = 1

        for i in dist[u]:
            if ignore[i] != 1:
                path[i] = u
                pos.append(i)

    route = deque([end])
    while True:
        next = path[route[0]]
        route.appendleft(next)
        if route[0] == sta:
            break

    return list(route)

route = router(N, 0, N - 1)

# NG以外のところで辿れるところの数
def dfs_ter(sta, ng):
    pos = deque([sta])

    ignore = [0] * N
    for i in ng:
        ignore[i] = 1

    cnt = 0
    while len(pos) > 0:
        u = pos.popleft()
        ignore[u] = 1
        cnt += 1
        for i in dist[u]:
            if ignore[i] != 1:
                pos.append(i)

    return cnt

L = len(route)
fen_ter = route[:(L + 2 - 1) // 2]
snu_ter = route[(L + 2 - 1) // 2:]

fen_ans = dfs_ter(0, snu_ter)

if fen_ans > N - fen_ans:
    print('Fennec')
else:
    print('Snuke')

Buggy python submission (verdict: Time Limit Exceeded):
def getN():
    return int(input())
def getNM():
    return map(int, input().split())
def getList():
    return list(map(int, input().split()))
def getArray(intn):
    return [int(input()) for i in range(intn)]
def input():
    return sys.stdin.readline().rstrip()
def rand_N(ran1, ran2):
    return random.randint(ran1, ran2)
def rand_List(ran1, ran2, rantime):
    return [random.randint(ran1, ran2) for i in range(rantime)]
def rand_ints_nodup(ran1, ran2, rantime):
  ns = []
  while len(ns) < rantime:
    n = random.randint(ran1, ran2)
    if not n in ns:
      ns.append(n)
  return sorted(ns)

def rand_query(ran1, ran2, rantime):
  r_query = []
  while len(r_query) < rantime:
    n_q = rand_ints_nodup(ran1, ran2, 2)
    if not n_q in r_query:
      r_query.append(n_q)
  return sorted(r_query)

from collections import defaultdict, deque, Counter
from sys import exit
from decimal import *
import heapq
import math
from fractions import gcd
import random
import string
import copy
from itertools import combinations, permutations, product
from operator import mul
from functools import reduce
from bisect import bisect_left, bisect_right

import sys
sys.setrecursionlimit(1000000000)
mod = 10 ** 9 + 7


#############
# Main Code #
#############

N = getN()
query = [getList() for i in range(N - 1)]

dist = [[] for i in range(N)]
for i in range(N - 1):
    a, b = query[i]
    dist[a - 1].append(b - 1)
    dist[b - 1].append(a - 1)

ignore = [0] * N
route = []

# nowからNまでのルート
def dfs(now, goal, array):
    global route
    if now == goal:
        route = array
        return

    ignore[now] = 1

    for i in dist[now]:
        if ignore[i] != 1:
            newarray = copy.deepcopy(array)
            newarray.append(i)
            dfs(i, goal, newarray)

    ignore[now] = 0

# ルート探索
dfs(0, N - 1, [0])

# NG以外のところで辿れるところの数
def dfs_ter(sta, ng):
    pos = deque([sta])

    ignore = [0] * N
    for i in ng:
        ignore[i] = 1

    cnt = 0
    while len(pos) > 0:
        u = pos.popleft()
        ignore[u] = 1
        cnt += 1
        for i in dist[u]:
            if ignore[i] != 1:
                pos.append(i)

    return cnt

L = len(route)
fen_ter = route[:(L + 2 - 1) // 2]
snu_ter = route[(L + 2 - 1) // 2:]

fen_ans = dfs_ter(0, snu_ter)
snu_ans = dfs_ter(N - 1, fen_ter)

if snu_ans >= fen_ans:
    print('Snuke')
else:
    print('Fennec')

Fixed submission:
def getN():
    return int(input())
def getNM():
    return map(int, input().split())
def getList():
    return list(map(int, input().split()))
def getArray(intn):
    return [int(input()) for i in range(intn)]
def input():
    return sys.stdin.readline().rstrip()
def rand_N(ran1, ran2):
    return random.randint(ran1, ran2)
def rand_List(ran1, ran2, rantime):
    return [random.randint(ran1, ran2) for i in range(rantime)]
def rand_ints_nodup(ran1, ran2, rantime):
  ns = []
  while len(ns) < rantime:
    n = random.randint(ran1, ran2)
    if not n in ns:
      ns.append(n)
  return sorted(ns)

def rand_query(ran1, ran2, rantime):
  r_query = []
  while len(r_query) < rantime:
    n_q = rand_ints_nodup(ran1, ran2, 2)
    if not n_q in r_query:
      r_query.append(n_q)
  return sorted(r_query)

from collections import defaultdict, deque, Counter
from sys import exit
from decimal import *
import heapq
import math
from fractions import gcd
import random
import string
import copy
from itertools import combinations, permutations, product
from operator import mul
from functools import reduce
from bisect import bisect_left, bisect_right

import sys
sys.setrecursionlimit(1000000000)
mod = 10 ** 9 + 7


#############
# Main Code #
#############

N = getN()
query = [getList() for i in range(N - 1)]

dist = [[] for i in range(N)]
for i in range(N - 1):
    a, b = query[i]
    dist[a - 1].append(b - 1)
    dist[b - 1].append(a - 1)

# nowからNまでのルート
def router(n, sta, end):
    pos = deque([sta])
    ignore = [0] * n
    path = [0] * n
    path[sta] = -1

    while pos[0] != end:
        u = pos.popleft()
        ignore[u] = 1

        for i in dist[u]:
            if ignore[i] != 1:
                path[i] = u
                pos.append(i)

    route = deque([end])
    while True:
        next = path[route[0]]
        route.appendleft(next)
        if route[0] == sta:
            break

    return list(route)

route = router(N, 0, N - 1)

# NG以外のところで辿れるところの数
def dfs_ter(sta, ng):
    pos = deque([sta])

    ignore = [0] * N
    for i in ng:
        ignore[i] = 1

    cnt = 0
    while len(pos) > 0:
        u = pos.popleft()
        ignore[u] = 1
        cnt += 1
        for i in dist[u]:
            if ignore[i] != 1:
                pos.append(i)

    return cnt

L = len(route)
fen_ter = route[:(L + 2 - 1) // 2]
snu_ter = route[(L + 2 - 1) // 2:]

fen_ans = dfs_ter(0, snu_ter)

if fen_ans > N - fen_ans:
    print('Fennec')
else:
    print('Snuke')

Buggy python submission (verdict: Time Limit Exceeded):
def getN():
    return int(input())
def getNM():
    return map(int, input().split())
def getList():
    return list(map(int, input().split()))
def getArray(intn):
    return [int(input()) for i in range(intn)]
def input():
    return sys.stdin.readline().rstrip()
def rand_N(ran1, ran2):
    return random.randint(ran1, ran2)
def rand_List(ran1, ran2, rantime):
    return [random.randint(ran1, ran2) for i in range(rantime)]
def rand_ints_nodup(ran1, ran2, rantime):
  ns = []
  while len(ns) < rantime:
    n = random.randint(ran1, ran2)
    if not n in ns:
      ns.append(n)
  return sorted(ns)

def rand_query(ran1, ran2, rantime):
  r_query = []
  while len(r_query) < rantime:
    n_q = rand_ints_nodup(ran1, ran2, 2)
    if not n_q in r_query:
      r_query.append(n_q)
  return sorted(r_query)

from collections import defaultdict, deque, Counter
from sys import exit
from decimal import *
import heapq
import math
from fractions import gcd
import random
import string
import copy
from itertools import combinations, permutations, product
from operator import mul
from functools import reduce
from bisect import bisect_left, bisect_right

import sys
sys.setrecursionlimit(1000000000)
mod = 10 ** 9 + 7


#############
# Main Code #
#############

N = getN()
query = [getList() for i in range(N - 1)]

dist = [[] for i in range(N)]
for i in range(N - 1):
    a, b = query[i]
    dist[a - 1].append(b - 1)
    dist[b - 1].append(a - 1)

ignore = [0] * N
route = []

# nowからNまでのルート
def dfs(now, goal, array):
    global route
    if now == goal:
        route = array
        return

    ignore[now] = 1

    for i in dist[now]:
        if ignore[i] != 1:
            newarray = copy.deepcopy(array)
            newarray.append(i)
            dfs(i, goal, newarray)

    ignore[now] = 0

# ルート探索
dfs(0, N - 1, [0])

# NG以外のところで辿れるところの数
def dfs_ter(sta, ng):
    pos = deque([sta])

    ignore = [0] * N
    for i in ng:
        ignore[i] = 1

    cnt = 0
    while len(pos) > 0:
        u = pos.popleft()
        ignore[u] = 1
        cnt += 1
        for i in dist[u]:
            if ignore[i] != 1:
                pos.append(i)

    return cnt

L = len(route)
fen_ter = route[:(L + 2 - 1) // 2]
snu_ter = route[(L + 2 - 1) // 2:]

fen_ans = dfs_ter(0, snu_ter)
snu_ans = dfs_ter(N - 1, fen_ter)

if snu_ans >= fen_ans:
    print('Snuke')
else:
    print('Fennec')

Fixed submission:
def getN():
    return int(input())
def getNM():
    return map(int, input().split())
def getList():
    return list(map(int, input().split()))
def getArray(intn):
    return [int(input()) for i in range(intn)]
def input():
    return sys.stdin.readline().rstrip()
def rand_N(ran1, ran2):
    return random.randint(ran1, ran2)
def rand_List(ran1, ran2, rantime):
    return [random.randint(ran1, ran2) for i in range(rantime)]
def rand_ints_nodup(ran1, ran2, rantime):
  ns = []
  while len(ns) < rantime:
    n = random.randint(ran1, ran2)
    if not n in ns:
      ns.append(n)
  return sorted(ns)

def rand_query(ran1, ran2, rantime):
  r_query = []
  while len(r_query) < rantime:
    n_q = rand_ints_nodup(ran1, ran2, 2)
    if not n_q in r_query:
      r_query.append(n_q)
  return sorted(r_query)

from collections import defaultdict, deque, Counter
from sys import exit
from decimal import *
import heapq
import math
from fractions import gcd
import random
import string
import copy
from itertools import combinations, permutations, product
from operator import mul
from functools import reduce
from bisect import bisect_left, bisect_right

import sys
sys.setrecursionlimit(1000000000)
mod = 10 ** 9 + 7


#############
# Main Code #
#############

N = getN()
query = [getList() for i in range(N - 1)]

dist = [[] for i in range(N)]
for i in range(N - 1):
    a, b = query[i]
    dist[a - 1].append(b - 1)
    dist[b - 1].append(a - 1)

# nowからNまでのルート
def router(n, sta, end):
    pos = deque([sta])
    ignore = [0] * n
    path = [0] * n
    path[sta] = -1

    while pos[0] != end:
        u = pos.popleft()
        ignore[u] = 1

        for i in dist[u]:
            if ignore[i] != 1:
                path[i] = u
                pos.append(i)

    route = deque([end])
    while True:
        next = path[route[0]]
        route.appendleft(next)
        if route[0] == sta:
            break

    return list(route)

route = router(N, 0, N - 1)

# NG以外のところで辿れるところの数
def dfs_ter(sta, ng):
    pos = deque([sta])

    ignore = [0] * N
    for i in ng:
        ignore[i] = 1

    cnt = 0
    while len(pos) > 0:
        u = pos.popleft()
        ignore[u] = 1
        cnt += 1
        for i in dist[u]:
            if ignore[i] != 1:
                pos.append(i)

    return cnt

L = len(route)
fen_ter = route[:(L + 2 - 1) // 2]
snu_ter = route[(L + 2 - 1) // 2:]

fen_ans = dfs_ter(0, snu_ter)

if fen_ans > N - fen_ans:
    print('Fennec')
else:
    print('Snuke')