Harryxun/stf_run huggingface dataset:
N, K = map(int, input().split())
S = input()
new_S = []
count_S = []

cur_c = S[0]
cur_count = 0

new_S.append(cur_c)
for c in S:
    if c == cur_c:
        cur_count += 1
    else:
        new_S.append(c)
        count_S.append(cur_count)
        cur_count = 1
        cur_c = c
count_S.append(cur_count)
        

new_count = []
st_ix = 0
if S[0] == '0':
    cur_sum = sum(count_S[:2*K])
    st_ix = 1
    new_count.append(cur_sum)

else:
    cur_sum = sum(count_S[:2*K+1])
    new_count.append(cur_sum)

en_ix = st_ix + 2*K + 1
cur_sum = sum(count_S[st_ix:en_ix])
new_count.append(cur_sum)
while en_ix < len(count_S):
    # shift st_ix
    st_ix = st_ix + 2
    en_ix = en_ix + 2
    cur_sum -= (count_S[st_ix-2] + count_S[st_ix-1])
    cur_sum += (count_S[en_ix-2] + count_S[en_ix-1])
    new_count.append(cur_sum)

print(max(new_count))


### FIXED CODE ###

N, K = map(int, input().split())
S = input()
new_S = []
count_S = []

cur_c = S[0]
cur_count = 0

new_S.append(cur_c)
for c in S:
    if c == cur_c:
        cur_count += 1
    else:
        new_S.append(c)
        count_S.append(cur_count)
        cur_count = 1
        cur_c = c
count_S.append(cur_count)        

new_count = []
st_ix = 0
if S[0] == '0':
    cur_sum = sum(count_S[:2*K])
    st_ix = 1
    new_count.append(cur_sum)
else:
    cur_sum = sum(count_S[:2*K+1])
    new_count.append(cur_sum)

en_ix = st_ix + 2*K + 1
cur_sum = sum(count_S[st_ix:en_ix])
new_count.append(cur_sum)

while en_ix < len(count_S):
    # shift st_ix
    st_ix = st_ix + 2
    en_ix = en_ix + 2
    if en_ix >= len(count_S):
        new_count.append(sum(count_S[st_ix:]))
    else:
        cur_sum -= (count_S[st_ix-2] + count_S[st_ix-1])
        cur_sum += (count_S[en_ix-2]
                        + count_S[en_ix-1])
    new_count.append(cur_sum)

print(max(new_count))
def resolve():
    h, w  = map(int, input().split())
    a = [list(map(int, input().split())) for _ in range(h)]
    ans = []
    for i in range(h):
        for j in range(w):
            if j != w-1 :
                if a[i][j] % 2 == 0:
                    continue
                else:
                    ans.append([i+1, j+1, i+1, j+2])
                    a[i][j+1] += 1
    for i in range(h):
        if i != h-1:
            if a[i][w-1] & 2 == 0:
                continue
            else:
                ans.append([i+1, j+1, i+2, j+1])
                a[i][j+1] += 1
    print(len(ans))
    for i in range(len(ans)):
        print(*ans[i])
resolve()

### FIXED CODE ###


def resolve():
    h, w  = map(int, input().split())
    a = [list(map(int, input().split())) for _ in range(h)]
    ans = []
    for i in range(h):
        for j in range(w):
            if j != w-1 :
                if a[i][j] % 2 == 0:
                    continue
                else:
                    ans.append([i+1, j+1, i+1, j+2])
                    a[i][j+1] += 1
                    a[i][j] -= 1
    for i in range(h):
        if i != h-1:
            if a[i][w-1] % 2 == 0:
                continue
            else:
                ans.append([i+1, j+1, i+2, j+1])
                a[i+1][w-1] += 1
                a[i][w-1] -= 1
    print(len(ans))
    for i in range(len(ans)):
        print(*ans[i])
resolve()
S=input()
T=input()
ANS=[]
for start in range(len(S)-len(T)):
  ans = 0
  for j in range(len(T)):
    if S[start] != T[j]:
      ans += 1
  ANS.append(ans)
print(min(ANS))
  

### FIXED CODE ###

S = input()
T = input()
ans = len(T)
for start in range(len(S) - len(T) + 1):
  dif = 0
  for i in range(len(T)):
    if T[i] != S[start + i]:
      dif += 1
  ans = min(ans, dif) 
print(ans)
w = input()

ans = "No"
for i in w:
    if w.count(i)%2! = 0:
        break
else:
    ans = "Yes"

print(ans)



### FIXED CODE ###

w = input()

ans = "No"
for i in w:
    if w.count(i)%2!= 0:
        break
else:
    ans = "Yes"
print(ans)
import sys
sys.setrecursionlimit(100000)
def cmb(n, r, mod):
    if ( r<0 or r>n ):
        return 0
    r = min(r, n-r)
    return g1[n] * g2[r] * g2[n-r] % mod

mod = 10**9+7 #出力の制限
N = 10**4
g1 = [1, 1] # 元テーブル
g2 = [1, 1] #逆元テーブル
inverse = [0, 1] #逆元テーブル計算用テーブル

for i in range( 2, N + 1 ):
    g1.append( ( g1[-1] * i ) % mod )
    inverse.append( ( -inverse[mod % i] * (mod//i) ) % mod )
    g2.append( (g2[-1] * inverse[-1]) % mod )
n,k = map(int,input().split())
lis = list(map(int,input().split()))
lis.sort()
ans = 0
for i in range(n):
    if i >= k-1:
        ans += lis[i] * cmb(i,k-1,mod)
    if n-i-1 >= k-1:
        ans -= lis[i] * cmb(n-i-1,k-1,mod)
    ans %= 10 ** 9+7
print(ans)

### FIXED CODE ###

import sys
sys.setrecursionlimit(1000000)
def cmb(n, r, mod):
    if ( r<0 or r>n ):
        return 0
    r = min(r, n-r)
    return g1[n] * g2[r] * g2[n-r] % mod

mod = 10**9+7 #出力の制限
g1 = [1, 1] # 元テーブル
g2 = [1, 1] #逆元テーブル
inverse = [0, 1] #逆元テーブル計算用テーブル


n,k = map(int,input().split())
lis = list(map(int,input().split()))
lis.sort()
ans = 0
for i in range( 2, n + 1 ):
    g1.append( ( g1[-1] * i ) % mod )
    inverse.append( ( -inverse[mod % i] * (mod//i) ) % mod )
    g2.append( (g2[-1] * inverse[-1]) % mod )
for i in range(n):
    if i >= k-1:
        ans += lis[i] * cmb(i,k-1,mod)
    if n-i-1 >= k-1:
        ans -= lis[i] * cmb(n-i-1,k-1,mod)
    ans %= 10 ** 9+7
print(ans)
X = int(input())

print( (X//500)*1000 + ((X%500)//5)*5 

### FIXED CODE ###

X = int(input())

print( (X//500)*1000 + ((X%500)//5)*5 )
class exist_negative_cycle(Exception):
    pass
def bellman_ford(g, size, start=0):
    d = [float('inf')] * size
    d[start] = 0
   
    for _ in range(size):
        for u in g:
            for length, v in g[u]:
                if d[v] > d[u] + length:
                    d[v] = d[u] + length

    for u in g:
        for length, v in g[u]:
            if d[v] > d[u] + length:
                raise exist_negative_cycle    
    return d
from sys import stdin
readline = stdin.readline

from collections import defaultdict

vertex, edge, r = map(int, readline().split())

g = defaultdict(list)
for i in range(edge):
    s, t, length = map(int, readline().split())
    g[s].append((length, t))
try:
    d = bellman_ford(g, vertex, r)
    for di in d:
        print('INF' if math.isinf(di) else di)
except exist_negative_cycle:
    print('NEGATIVE CYCLE')

### FIXED CODE ###

class exist_negative_cycle(Exception):
    pass
def bellman_ford(g, size, start=0):
    d = [float('inf')] * size
    d[start] = 0
   
    for _ in range(size):
        for u in g:
            for length, v in g[u]:
                if d[v] > d[u] + length:
                    d[v] = d[u] + length

    for u in g:
        for length, v in g[u]:
            if d[v] > d[u] + length:
                raise exist_negative_cycle    
    return d
from sys import stdin
readline = stdin.readline
import math
from collections import defaultdict

vertex, edge, r = map(int, readline().split())

g = defaultdict(list)
for i in range(edge):
    s, t, length = map(int, readline().split())
    g[s].append((length, t))
try:
    d = bellman_ford(g, vertex, r)
    for di in d:
        print('INF' if math.isinf(di) else di)
except exist_negative_cycle:
    print('NEGATIVE CYCLE')
mojiretu = input()

a = mojiretu.count(a)
b = mojiretu.count(b)
c = mojiretu.count(c)

if int(a)+int(b)+int(c)==3:
    print("Yes")
else:
    print("No")

### FIXED CODE ###

mojiretu = input()

a = mojiretu.count("a")
b = mojiretu.count("b")
c = mojiretu.count("c")

if int(a) ==1 and int(b) ==1 and int(c)==1:
    print("Yes")
else:
    print("No")
n=int(input())
z=0
for i in range(n):
  a,b=intput().split()
  a=float(a)
  z+=a*380000 if b=="BTC" else a
print(z)

### FIXED CODE ###

s=input()
if(s>"2019/04/30"):
   print("TBD")
else:
   print("Heisei")
n = input()
print((n // 2) / n)

### FIXED CODE ###

n = float(input())
print((n - n // 2) / n)
x,y,z = map(int,input().split())
n = (y if x < y else x) 
array = []
for i in range(1,n):
	if (x%i==0 and y%i==0):
		array.append(i)
array.reverse()
print(array[z-1])


### FIXED CODE ###

x,y,z = map(int,input().split())
n = (y if x < y else x) 
n += 1
array = [1]
for i in range(1,n):
	if (x%i==0 and y%i==0):
		array.append(i)
array.reverse()
print(array[z-1])
N,K = map(int,input().split())
P=list(map(int,input().split()))


maxnum=0
index=0
num=0
for i in range(len(P)-2):
    num+=P[i]



    if maxnum<num:
        maxnum=num
        index=i

    if i>=K:
        num-=P[i-(K-1)]
List=[]

for i in range(K):
    x1=P[index+i]
    sumx1=0
    for j in range(1,x1+1):
        sumx1+=j

    sumx1=sumx1/x1
    List.append(sumx1)


print(sum(List))


### FIXED CODE ###

import math
N,K = map(int,input().split())
P=list(map(int,input().split()))


maxnum=0
index=0
num=0
for i in range(len(P)):
    num+=P[i]
    if maxnum<num:
        maxnum=num
        index=i




    if i>=K-1:
        num-=P[i-(K-1)]


List=[]
for i in range(K):
    x1=P[index-i]

    sumx1=(1+x1)/2
    List.append(sumx1)


print(sum(List))
n = int(input())
s = int(input())

flag = False

if s == n:
  print(n+1)
  exit()

def chk(b, n):
  if n//b == 0:
    return n
  else:
    return chk(b,n//b) + n%b

for b in range(2, int(n**0.5)+1):
  if chk(b, n) == s:
    print(b)
    flag = True
    exit()

for i in range(int(n**0.5), 0, -1):
  b = (n-s)//i + 1
  if chk(b, n) == s:
    print(b)
    flag = True
    break

if flag == False:
  print(-1)

### FIXED CODE ###

n = int(input())
s = int(input())

flag = False
if s > n or (n//2)+1<s<n:
  print(-1)
  exit()
  
if s == n:
  print(n+1)
  exit()

def chk(b, n):
  if n//b == 0:
    return n
  else:
    return chk(b,n//b) + n%b

for b in range(2, int(n**0.5)+1):
  if chk(b, n) == s:
    print(b)
    flag = True
    exit()

for i in range(int(n**0.5), 0, -1):
  b = (n-s)//i + 1
  if chk(b, n) == s:
    if b > 1:
      print(b)
      flag = True
      exit()

if flag == False:
  print(-1)
a, b, k = map(int, input().split())
if a == 1 or b == 1:
    print(1)
    exit()
l = [i for i in range(1, min(a, b)) if a % i == 0 and b % i ==0]
l.sort(reverse=True)
print(l[k-1])

### FIXED CODE ###

a, b, k = map(int, input().split())
if a == 1 or b == 1:
    print(1)
    exit()
l = [i for i in range(1, min(a, b)+1) if a % i == 0 and b % i ==0]
l.sort(reverse=True)
print(l[k-1])
C=[0]*3;A=[0]*3
d1=0;d2=0;e1=0;e2=0;z=0;p=0
for i in range(3):
  c1,c2,c3=map(int,input().split())
  C[i]=(c1,c2,c3)
  A[i]=(0,0,0)

d1=C[1][0]-C[0][0];d2=C[2][0]-C[0][0]
e1=C[0][1]-C[0][0];e2=C[0][2]-C[0][0]
z=C[0][0]
A[0][0]=z;A[0][1]=z+e1;A[0][2]=z+e2
A[1][0]=z+d1;A[1][1]=z+e1+d1;A[1][2]=z+d1+e2
A[2][0]=z+d2;A[2][1]=z+d2+e1;A[2][2]=z+d2+e2

print(C)
for i in range(3):
  for j in range(3):
    if C[i][j]==A[i][j]:
      p=p+1
print("Yes" if p==9 else "No")

### FIXED CODE ###

C=[0]*3;A=[0]*3
d1=0;d2=0;e1=0;e2=0;z=0;p=0
for i in range(3):
  c1,c2,c3=map(int,input().split())
  C[i]=[c1,c2,c3]
  A[i]=[0,0,0]
 
d1=C[1][0]-C[0][0];d2=C[2][0]-C[0][0]
e1=C[0][1]-C[0][0];e2=C[0][2]-C[0][0]
z=C[0][0]
A[0][0]=z;A[0][1]=z+e1;A[0][2]=z+e2
A[1][0]=z+d1;A[1][1]=z+e1+d1;A[1][2]=z+d1+e2
A[2][0]=z+d2;A[2][1]=z+d2+e1;A[2][2]=z+d2+e2
 
#print(C)
for i in range(3):
  for j in range(3):
    if C[i][j]==A[i][j]:
      p=p+1
print("Yes" if p==9 else "No")
m,k=map(int,input().split())
A=list(map(int,input().split()))
d=Counter(A)
l=d.most_common()[::-1]
s=set(A)
ans=0
i=0
while len(s)>k:
  ans+=l[i][1]
  del d[l[i]]
  s=len(d)
  i+=1
print(ans)

### FIXED CODE ###

from collections import Counter
m,k=map(int,input().split())
A=list(map(int,input().split()))
d=Counter(A)
l=d.most_common()[::-1]
ans=0
i=0
while len(d)>k:
  ans+=l[i][1]
  del d[l[i][0]]
  i+=1
print(ans)
import math
a,b = map(int,input().split())
print(a * b / (math.gcd(a,b)))

### FIXED CODE ###

import fractions
a,b = map(int,input().split())
print(a*b//(fractions.gcd(a,b)))
a,b,x = map(int,input().split())
n = 0
for i in range(a,b+1):
  if x % i == 0:
    n += 1
  else:
    pass
print(n)

### FIXED CODE ###

import math
a,b,x = map(int,input().split())
def f(p):
  if p >= 0:
    return p//x + 1
  else:
    return 0
print(f(b)-f(a-1))
N =  map(int,input())
a = []
for i in range(N):
    a.append(map(int, input())



for i in range(N):
    v = a[i]
    j = i-1
    while j>=0 and a[j]>v:
        a[j+1] = a[j]
        j = j-1
        a[j+1] = v
    print(a) 


### FIXED CODE ###

N = int(input())
a = input().split()
b = [int(n) for n in a]


for i in range(N):
    v = b[i]
    j = i-1
    while j>=0 and b[j]>v:
        b[j+1] = b[j]
        j = j-1
        b[j+1] = v
    print(" ".join([str(n) for n in b]))
n=int(input())
a=[int(input() for i in range(n)]
b=a[::2]
c=a[1::2]
b.sort()
c.sort()
a=[c[i] if i&1 else b[i] for i in range(n)]
cnt=0
for i in range(n-1):
	if a[i]>a[i+1]:
		cnt+=1
		a[i],a[i+1]=a[i+1],a[i]
print(cnt)

### FIXED CODE ###

from collections import Counter
n=int(input())
a=[int(input()) for i in range(n)]
b=Counter(a[::2])
a.sort()
c=Counter(a[::2])

ans=0
for i in b:
	if i in c:
		ans+=abs(b[i]-c[i])
	else:
		ans+=b[i]
print(ans)
n = int(input())
for i in range(n,-1,-1):
  if sqrt(i) == int(sqrt(i)):
    print(i)
    exit()

### FIXED CODE ###

import math as m
n = int(input())
for i in range(n,-1,-1):
  if m.sqrt(i) == int(m.sqrt(i)):
    print(i)
    exit()
S=list(input())

chara=list("abcdefghijklmnopqrstuvwxyz")
chara_dic={}
for i in range(len(chara)):
	chara_dic[chara[i]]=i
chara_dic_2={}
for i in range(len(chara)):
	chara_dic_2[i]=chara[i]

count={}
for s in S:
	count[s]=count.get(s,0)+1

flag=0
if len(count)==len(chara):
	cur_chara=len(S)-1
	for pt in range(len(S)-2,0,-1):
		if chara_dic[S[cur_chara]]==chara_dic[S[pt]]-1:
			cur_chara-=1
		else:
			flag=1
			ans=''
			for i in range(0,pt):
				ans+=str(S[i])
			ans+=chara_dic_2[chara_dic[S[pt]]+1]
			break
else:
	flag=1
	ans=''
	for i in range(len(S)):
		ans+=S[i]
	for i in range(len(chara)):
		if chara[i] not in S:
			end=chara[i]
			break
	ans+=end

print(ans if flag else "-1")

### FIXED CODE ###

S=list(input())

chara=list("abcdefghijklmnopqrstuvwxyz")
chara_dic={}
for i in range(len(chara)):
	chara_dic[chara[i]]=i
chara_dic_2={}
for i in range(len(chara)):
	chara_dic_2[i]=chara[i]

count={}
for s in S:
	count[s]=count.get(s,0)+1

flag=0
if len(count)==len(chara):
	cur_chara=len(S)-1
	for pt in range(len(S)-2,-1,-1):
		if chara_dic[S[cur_chara]]<chara_dic[S[pt]]:
			cur_chara-=1
		else:
			flag=1
			ans=''
			for i in range(0,pt):
				ans+=str(S[i])
			ls=[]
			for i in range(pt+1,len(S)):
				if chara_dic[S[pt]]<chara_dic[S[i]]:
						ls.append(chara_dic[S[i]])
			ans+=chara_dic_2[min(ls)]
			break
else:
	flag=1
	ans=''
	for i in range(len(S)):
		ans+=S[i]
	for i in range(len(chara)):
		if chara[i] not in S:
			end=chara[i]
			break
	ans+=end

print(ans if flag else "-1")
a, b, c, d = map(int, input().split())
print(max(a*c, b*c, b*d a*d))


### FIXED CODE ###

a, b, c, d = map(int, input().split())
print(max(a*c, b*c, b*d, a*d))
a, b, k = [int(x) for x in input().split()]
lst = list(range(a, b + 1))
res = []
res.extend(lst[:k])
res.extend(lst[-k:])
res = sorted(set(res))
print(*res, sep='\n')


### FIXED CODE ###

a, b, k = [int(x) for x in input().split()]
r = range(a, b + 1)
for i in sorted(set(r[:k]) | set(r[-k:])):
    print(i)
s = input()
s = s.replace('eraser','z')
s = s.repalace('erase','z')
s = s.repalace('dreamer','z')
s = s.repalace('dream','z')
for  S in s:
    if S != z:
        print('NO')
    else:
        print('YES')


### FIXED CODE ###

s = input()
s = s.replace('eraser','z')
s = s.replace('erase','z')
s = s.replace('dreamer','z')
s = s.replace('dream','z')
for  S in s:
    if S != 'z':
        print('NO')
        exit()
print('YES')
from collections import deque
H, W = map(int, input().split()) 
S = [list(input()) for i in range(R)]

Kuro = 0
Shiro = 0
for j in range(H):
    for i in range(W):
        if S[j][i]=='.':
            Shiro += 1
        else:
            Kuro += 1

Dis =[[0]*W for i in range(H)]
X =[-1, 0, 1, 0]
Y =[0, -1, 0, 1]
q = deque()
q.append((0,0))
while True:
    y,x = q.popleft()
    if (y==H-1) and (x==W-1):
        break
    for i in range(4):
        nx = x + X[i]
        ny = y + Y[i]
        if (0<= nx < W) and(0 <= ny < H) and (S[ny][nx]=='.') and(Dis[ny][nx] ==0):
            q.append((ny,nx))
            Dis[ny][nx] = Dis[y][x] +1

print(Shiro-Dis[H-1][W-1]-1)    

### FIXED CODE ###

import sys
from collections import deque
sys.setrecursionlimit(10**8)

H, W = map(int, input().split()) 
S = [list(input()) for i in range(H)]

Kuro = 0
Shiro = 0
for j in range(H):
    for i in range(W):
        if S[j][i]=='.':
            Shiro += 1
Dis =[[-1]*W for i in range(H)]
X =[-1, 0, 1, 0]
Y =[0, -1, 0, 1]
q = deque()
q.append((0,0))
Dis[0][0] = 0
a=deque()
while (q != a):
    y,x = q.popleft()
    if (y==H-1) and (x==W-1):
        break
    for i in range(4):
        nx = x + X[i]
        ny = y + Y[i]
        if (0<= nx < W) and(0 <= ny < H) and (S[ny][nx]=='.') and (Dis[ny][nx] ==-1):
            q.append((ny,nx))
            Dis[ny][nx] = Dis[y][x] +1

if (Dis[H-1][W-1]==-1):
    print(-1)
else:
    print(Shiro-Dis[H-1][W-1]-1)
import math as mt

N = int(input())
A = list(map(int, input().split()))


def solve(n: int, a: list):
    lgcd = [0] * (n - 1)
    lgcd[0] = a[0]
    for i in range(1, n - 1):
        lgcd[i] = mt.gcd(a[i], lgcd[i - 1])
    a.reverse()

    rgcd = [0] * (n - 1)
    rgcd[0] = a[0]
    for i in range(1, n - 1):
        rgcd[i] = mt.gcd(a[i], rgcd[i - 1])
    a.reverse()

    ans = [0] * n
    ans[0] = rgcd[n - 2]
    ans[n - 1] = lgcd[n - 2]
    for i in range(1, n):
        ans[i] = mt.gcd(lgcd[i - 1], rgcd[n - 2 - i])

    return max(ans)


print(solve(N, A))


### FIXED CODE ###

from fractions import *

n, *a = map(int, open(0).read().split())
b = [0]
for i in a:
    b += gcd(b[-1], i),
w = m = 0
for i in range(n):
    m = max(m, gcd(w, b[-i - 2]))
    w = gcd(w, a[~i])
print(m)
a, b, c = map(int, input().split())
print(a[:1] + b[:1] + c[:1])

### FIXED CODE ###

a, b, c = map(str, input().split())

print("A" + b[:1] + "C")
A,B,C = map(int,input().split())
if C-(a-B)>=0:
    print(C-(A-B))
else:
    print(0)

### FIXED CODE ###

A,B,C = map(int,input().split())
if C-(A-B)>=0:
    print(C-(A-B))
else:
    print(0)
n, q = map(int,input().split())
cnt = [0] * (n+1)
import sys
sys.setrecursionlimit(10**9)
import numpy as np
tree = np.zeros((n+1, n+1))
child = [0] * (n+1)
for i in range(n-1):
    a, b = map(int,input().split())
    tree[a][b] = 1
    tree[b][a] = 1
def dfs(i):
    global child
    child[i] = []
    if np.all(tree[i]):
        return
    for j in range(n+1):
        if tree[i][j] == 1:
            tree[j][i] = 0
            child[i].append(j)
            dfs(j)
    return

dfs(1)
#print(child)
for _ in range(q):
    p,x = map(int,input().split())
    cnt[p] += x
def plus(c):
    global cnt
    if child[c] == []:
        return
    for target in child[c]:
        cnt[target] += cnt[c]
        plus(target)
    return
plus(1)
print(*cnt[1:])

### FIXED CODE ###

n, q = map(int,input().split())
cnt = [0] * (n+1)
tree = [[] for _ in range(n+1)]
seen = [0] * (n+1)
todo = [1]
for i in range(n-1):
    a, b = map(int,input().split())
    tree[a].append(b)
    tree[b].append(a)
for _ in range(q):
    p,x = map(int,input().split())
    cnt[p] += x

while todo != []:
    i = todo.pop()
    seen[i] = 1
    for j in tree[i]:
        if seen[j] == 0:
            todo.append(j)
            cnt[j] += cnt[i]
print(*cnt[1:])
n = int(input())
str = input()
int s = n/2
if str[:s] == str[s:]
	print('Yes')
else
	print('No')

### FIXED CODE ###

n = int(input())
str = input()
if n%2 == 1:
    print('No')
else:
    if str[:n//2] == str[n//2:]:
	    print('Yes')
    else:
	    print('No')
N = int(input())
A = list(map(int,input().split()))
from fractions import gcd

setwise = A[0]

A = sorted(A,reverse = True)
prime = [0] * (10**6+1)
judge = True

for a in A:
  setwise = gcd(setwise,a)
  if prime[a]:
    continue
  else:
    prime[a] += 1
    if a%2==0:
      if prime[2]:
        judge = False
      prime[2] += 1
      a//=2
      if (a!=2)and(prime[a]):
        judge = False
      prime[a] += 1
    
    for i in range(3,int((a)**(1/2))+1,2):
      if a%i==0:
        if prime[i]:
          judge = False
        prime[i] += 1
        
if judge:
  print(ans)
  
elif setwise==1:
  print('setwise coprime')
else:
  print('not coprime')

### FIXED CODE ###

N = int(input())
A = list(map(int,input().split()))

A = sorted(A,reverse = True)
prime = [0] * (10**6+1)
eratos = [True] * (A[0] + 1)
D = [0] * (A[0]+1)
D[1] = 1
for i in range(2,A[0] + 1):
  if not eratos[i]:
    continue
  else:
    for j in range(i,A[0] + 1,i):
      if not D[j]:
        D[j] = i
      if j!=i:
      	eratos[j] = False
  
for a in A:
  while a!=1:
    x = D[a]
    while a%x==0:
      a//=x
    prime[x] += 1

if max(prime)<=1:
  print('pairwise coprime')
  
elif max(prime)!=N:
  print('setwise coprime')
else:
  print('not coprime')
a, b = map(int, input().split)

cover_b = b * 2
if cover_b > a:
  print(0)

else:
  print(a - cover_b)


### FIXED CODE ###

a, b = map(int, input().split())

cover_b = b * 2
if cover_b > a:
  print(0)

else:
  print(a - cover_b)
w = list(map(str,input()))
w.sort()
w = "".join(w)

flag = 0
w = [w[i*2:i*2+2] for i in range(-(-len(w)//2))]
for i in w:
  if not i[0] == i[1]:
    flag = 1

print("Yes") if not flag else print("No")

### FIXED CODE ###

w = list(map(str,input()))
w.sort()
w = "".join(w)

flag = 0
w = [w[i*2:i*2+2] for i in range(-(-len(w)//2))]
for i in w:
  if len(i)==1 or not i[0] == i[1]:
    flag = 1
    break

print("Yes") if not flag else print("No")
n, m = map(int, input().split())
MOD = 1000000007

traps = {}
for i in range(m):
    t = int(input())
    traps[t] = 1

mem = {}

def f(k):
    if k in mem:
        return mem[k]

    if k >= n:
        return 0
    if k == n - 1:
        return 1
    if k == n - 2:
        if n - 1 in traps:
            return 1
        else:
            return 2

    res = 0
    if k + 1 not in traps:
        res += f(k + 1)
    if k + 2 not in traps:
        res += f(k + 2)
    mem[k] = res
    return res % MOD

print(f(0))

### FIXED CODE ###

import sys
sys.setrecursionlimit(10 ** 8)

n, m = map(int, input().split())
MOD = 1000000007

traps = {}
for i in range(m):
    t = int(input())
    traps[t] = 1

mem = {}

def f(k):
    if k in mem:
        return mem[k]

    if k >= n:
        return 0
    if k == n - 1:
        return 1
    if k == n - 2:
        if n - 1 in traps:
            return 1
        else:
            return 2

    res = 0
    if k + 1 not in traps:
        res += f(k + 1)
    if k + 2 not in traps:
        res += f(k + 2)
    mem[k] = res

    return res % MOD

print(f(0))
a = int(input())
b = int(input())
c = int(input())
print(a[0] + b[1] + c[2])

### FIXED CODE ###

print(input()[0] + input()[1] + input()[2])
n = int(input())
a = list(map(int,input().split()))
ans = 0
for i in range(1,n+1) :
    if a[i] - a[i-1] >= 0 :
        continue
    else :
        ans += abs(a[i] - a[i-1])
        a[i] += abs(a[i] - a[i-1])
print(ans)

### FIXED CODE ###

n = int(input())
a = list(map(int,input().split()))
ans = 0
for i in range(n-1) :
    if a[i+1] - a[i] >= 0 :
        continue
    else :
        ans += abs(a[i+1] - a[i])
        a[i+1] += abs(a[i+1] - a[i])
print(ans)
k = int(input())
s = inpur()
x = len(s)

if k >= x:
  print(s)

else:
  print(s + "...")


### FIXED CODE ###

k = int(input())
s = input()
x = len(s)
if x <= k :
  print(s)
else:
  print(s[0:k] + "...")