Harryxun/sft_time huggingface dataset:
### BUGGY CODE ###

# -*- coding:utf-8 -*-
def my_pow(x,n):
    if n == 0:
        return 1
    if n % 2 == 0:
        return my_pow(x**2,n/2)
    else:
        return my_pow(x,int(n-1))*x
    
n,m = map(int,input().split())
x = 1000000007
print(my_pow(n,m)%x)

### FIXED CODE ###

def mpow(x,n,mod):
    if n == 0:
        return 1
    if n % 4 == 0:
        return mpow((x**4)%mod,int(n/4),mod)
    elif n%4 == 1:
        return (mpow(x,int(n-1),mod)*x)%mod
    elif n%4 == 2:
        return (mpow(x,int(n-2),mod)*(x**2))%mod
    elif n%4 == 3:
        return (mpow(x,int(n-3),mod)*(x**3))%mod
n,m = map(int,input().split())
mod = 1000000007
print(mpow(n,m,mod))
### BUGGY CODE ###

import collections

H, W = map(int, input().split())
Ch, Cw = map(lambda x: int(x) - 1, input().split())
Dh, Dw = map(lambda x: int(x) - 1, input().split())
grid = [[item for item in input()] for _ in range(H)]
max_num = 10**6
fp = [[max_num for _ in range(W)] for _ in range(H)]

que = collections.deque([[Ch, Cw, 0]])
fp[Ch][Cw] = 0
next_y_x = []
for i in range(5):
    for j in range(5):
        next_y_x.append([-2 + i, -2 + j])
next_y_x.remove([0,0])

while que:
    y, x, w_num = que.popleft()

    for dy, dx in next_y_x:
        ny = y + dy
        nx = x + dx

        if 0 <= ny <= H-1 and 0 <= nx <= W-1:
            if abs(dy) + abs(dx) == 1:
                if grid[ny][nx] == '.' and fp[ny][nx] > w_num:
                    que.appendleft([ny, nx, w_num])
                    fp[ny][nx] = w_num
            else:
                nw = w_num +1
                if grid[ny][nx] == '.' and fp[ny][nx] > nw:
                    que.append([ny, nx, nw])
                    fp[ny][nx] = nw

if fp[Dh][Dw] != max_num:
    print(fp[Dh][Dw])
else:
    print(-1)


### FIXED CODE ###

def resolve():
    '''
    code here
    '''
    from collections import deque

    H, W = [int(item) for item in input().split()]
    Ch, Cw = [int(item)-1 for item in input().split()]
    Dh, Dw = [int(item)-1 for item in input().split()]
    grid = [input() for _ in range(H)]
    max_num = 10**6
    fp = [[max_num] * W for _ in range(H)]

    que = deque([[Ch, Cw, 0]])
    fp[Ch][Cw] = 0

    walk = [(0, 1), (0, -1), (-1, 0), (1, 0)]
    warp = [(i, j) for i in range(-2, 3) for j in range(-2, 3) if (i, j) not in [(0, 0)] + walk]

    while que:
        y, x, w_num = que.popleft()

        for dy, dx in walk:
            ny = y + dy
            nx = x + dx

            if 0 <= ny <= H-1 and 0 <= nx <= W-1 and grid[ny][nx] == '.' and fp[ny][nx] > w_num:
                que.appendleft([ny, nx, w_num])
                fp[ny][nx] = w_num

        for dy, dx in warp:
            ny = y + dy
            nx = x + dx
            nw = w_num +1

            if 0 <= ny <= H-1 and 0 <= nx <= W-1 and grid[ny][nx] == '.' and fp[ny][nx] > nw:
                que.append([ny, nx, nw])
                fp[ny][nx] = nw

    if fp[Dh][Dw] != max_num:
        print(fp[Dh][Dw])
    else:
        print(-1)

if __name__ == "__main__":
    resolve()
### BUGGY CODE ###

from itertools import combinations 
n=int(input())
s=input()
ans=0
for i in range(1,n+1):
    koho=tuple(combinations([j for j in s],i))
    for j in range(len(koho)):
        if len(koho[j])==len(tuple(set(koho[j]))):
            ans+=1
print(ans)

### FIXED CODE ###

from collections import Counter
n=int(input())
s=input()
cnt=Counter(s)
ans=1
for i in cnt.values():
    ans*=i+1
print((ans-1)%(10**9+7))
### BUGGY CODE ###

n = int(input())
a = list(map(int, input().split()))
x = 0
for i in range(n):
    y = a.count(i + 1)
    x += y * (y - 1) / 2
for j in range(n):
    b = a.count(a[j])
    print(int(x - b + 1))

### FIXED CODE ###

n = int(input())
a = list(map(int, input().split()))
x = 0
b = [0] * n
for i in range(n):
    b[a[i] - 1] += 1

x = 0
for j in range(n):
    x += ((b[j] - 1) * b[j] / 2)

for k in range(n):
    print(int(x - b[a[k] - 1] + 1))
### BUGGY CODE ###

N=int(input())
S=str(input())
t=N*(N-1)*(N-2)//6
for i in range(N):
    for j in range(i+1,N):
        if S[i]==S[j]:
            t=t-(N-j-1)
        else:
            for k in range(j+1,N):
                if S[j]!=S[k] and S[i]!=S[k] and (i-j)!=(j-k):
                    continue
                else:
                    t=t-1
print (t)

### FIXED CODE ###

N=int(input())
S=str(input())
t=0
r=0
b=0
g=0
for i in range(N):
    if S[i]=='R':
        r+=1
    elif S[i]=='B':
        b+=1
    else:
        g+=1
for i in range(N):
    for j in range(i+1,N):
        if S[i]==S[j]:
            continue
        else:
            try:
                if S[2*j-i]!=S[j] and S[2*j-i]!=S[i]:
                    t+=1
                else:
                    continue
            except IndexError:
                break
print (r*b*g-t)
### BUGGY CODE ###

import math
from functools import reduce

def gcd(nums):
    return reduce(math.gcd, nums)

K = int(input())

ans = 0
for i in range(1, K+1):
    for j in range(1, K+1):
        for k in range(1, K+1):
            ans += gcd([i, j, k])

print(ans)

### FIXED CODE ###

import math
from functools import reduce
 
def gcd(nums):
    return reduce(math.gcd, nums)
 
K = int(input())
 
ans = 0
for i in range(1, K+1):
    for j in range(1, K+1):
        for k in range(1, K+1):
            ans += gcd([i, j, k])
 
print(ans)
### BUGGY CODE ###

import re
import sys
import math
import itertools
import bisect
from copy import copy
from collections import deque,Counter
from decimal import Decimal
import functools
def s(): return input()
def k(): return int(input())
def S(): return input().split()
def I(): return map(int,input().split())
def X(): return list(input())
def L(): return list(input().split())
def l(): return list(map(int,input().split()))
def lcm(a,b): return a*b//math.gcd(a,b)
sys.setrecursionlimit(10 ** 9)
mod = 10**9+7
cnt = 0
ans = 0
inf = float("inf")

n,k=I()
p = l()

for i in range(n-k+1):
    a = p[i:i+k]
    if ans < sum(a)+k:
        ans = sum(a)+k
        cnt = a

print(ans/2)


### FIXED CODE ###

import re
import sys
import math
import itertools
import bisect
from copy import copy
from collections import deque,Counter
from decimal import Decimal
import functools
def s(): return input()
def k(): return int(input())
def S(): return input().split()
def I(): return map(int,input().split())
def X(): return list(input())
def L(): return list(input().split())
def l(): return list(map(int,input().split()))
def lcm(a,b): return a*b//math.gcd(a,b)
sys.setrecursionlimit(10 ** 9)
mod = 10**9+7
cnt = 0
ans = 0
inf = float("inf")

n,k=I()
p = l()
x = list(itertools.accumulate(p))

if n==1:
    print((p[0]+1)/2)
    sys.exit()

if n==k:
    print((x[-1]+k)/2)
    sys.exit()

for i in range(1,n-k+1):
    ans = max(ans,x[i+k-1]-x[i-1])

print((ans+k)/2)
### BUGGY CODE ###

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

modn = int(1e9 + 7)

ret = 0
for i in range(0, len(A)-1):
  for j in range(i+1, len(A)):
    ret += A[i]*A[j] % modn


print(ret % modn)


### FIXED CODE ###

import numpy as np

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

modn = int(1e9 + 7)

ruiseki = sum(A)

ret = 0
for i in range(0, len(A)-1):
  ruiseki -= A[i]
  ret += A[i] * ruiseki

print(np.mod(ret, modn))
### BUGGY CODE ###

N, Q = map(int, input().split())
S = input()
lr_list = [list(map(int, input().split())) for q in range(Q)]

# 1文字目から n 文字目までの AC の数 = 1文字目から n - 1 文字目までの、Cを右に持つ A の数

where_ac = [0] * N

for i in range(N-1):
    if S[i] == 'A' and S[i+1] == 'C':
        where_ac[i+1] += 1

for lr in lr_list:
    print(sum(where_ac[0:lr[1]]) - sum(where_ac[0:lr[0]]))

### FIXED CODE ###

N, Q = map(int, input().split())
S = input()

where_ac = [0] * N

for i in range(N-1):    
  if S[i] == 'A' and S[i+1] == 'C':
    where_ac[i+1] = where_ac[i] + 1
  else:
    where_ac[i+1] = where_ac[i]
        
for q in range(Q):
  l, r = map(int, input().split())
  print(where_ac[r-1] - where_ac[l-1])
### BUGGY CODE ###

a, b = map(int, input().split())
w = input()
for i in range(b):
  c, d = map(int, input().split())
  w1 = w[c-1:d]
  print(w1.count("AC"))

### FIXED CODE ###

n,q = map(int,input().split())
s = list(input())

#a[i]:s[0]~s[i]までに何個ACがあったか
a = [0]*n
#end[i]:s[i]がACの'C'か
end = [False]*n
for i in range(1,n):
    if s[i] == 'C' and s[i-1] == 'A':
        a[i] = a[i-1]+1
        end[i] = True
    else:
        a[i] = a[i-1]
for i in range(q):
    L,R = map(int,input().split())
    L,R = L-1,R-1
    if L == 0:
        print(a[R])
    else:
        if end[L]:
            print(a[R]-a[L-1]-1)
        else:
            print(a[R]-a[L-1])
### BUGGY CODE ###

N, X, M = map(int, input().split())
A = [X]
a = X
s = X
r = 0
r0 = 0
l = 0
amari = 0

for i in range(N-1):
  a = a ** 2 % M
  if A.count(a) >= 1:
    if a == 0:
      s = sum(A)
      break
    else:
      r0 = A.index(a)
      l = len(A[r0:])
      r = (N - i - 1) // l
      amari = (N - i - 1) % l
      s = s + sum(A[r0:])*r + sum(A[r0:r0+amari])
      break
  A.append(a)
  s += A[-1]

print(s)

### FIXED CODE ###

N, X, M = map(int, input().split())
A = [X]
A_dict = {X}
a = X
s = X
r = 0
r0 = 0
l = 0
amari = 0

for i in range(M+1):
  a = a ** 2 % M
  if a in A_dict:
    r0 = A.index(a)
    l = len(A[r0:])
    r = (N - i - 1) // l
    amari = (N - i - 1) % l
    s = s + sum(A[r0:])*r + sum(A[r0:r0+amari])
    break
  A.append(a)
  A_dict.add(a)
  s += A[-1]

print(s)
### BUGGY CODE ###

def hash1(m,key):
    return key % m

def hash2(m,key):
    return 1 +  key % ( m -1 )

def hash(m,key,i):
    return (hash1(m,key) + i * hash2(m,key) ) % m

def insert(T,key):
    i = 0
    l = len(T)
    while True:
        h = hash(l,key,i)
        if (T[h] is None ):
            T[h] = key
            return h
        else:
            i += 1

def search(T,key):
    l = len(T)
    i = 0
    while True:
        h = hash(l,key,i)
        if(T[h] == key):
            return h
        elif(T[h] is None or h >= l):
            return -1
        else:
            i += 1

def find(T,key):
    a = search(T,key)
    if(a == -1):
        print('no')
    else:
        print('yes')

dict = {'A' : '1', 'C' : '2', 'G' : '3', 'T' : '4'}
data = []
T = [None]*4444
n = int(input())


while n > 0:
    st = input()
    d = list(st.split())

### convert key to num(1~4)
    tmp_key = ''
    for x in list(d[1]):
        tmp_key += dict[x]

    data.append([d[0],int(tmp_key)])
    n -= 1
for com in data:
    if(com[0] == 'insert'):
        insert(T,com[1]) 
    else:
        find(T,com[1])

### FIXED CODE ###

def hash1(m, key):
    return key % m

def hash2(m, key):
    return 1 +  key % (m - 1)

def hash(m, key, i):
    return (hash1(m, key) + i * hash2(m, key) ) % m

def insert(T, key):
    i = 0
    l = len(T)
    while True:
        h = hash(1046527,key,i)
        if (T[h] == None ):
            T[h] = key
            return h
        elif (T[h] == key):
            return h
        else:
            i += 1

def search(T,key):
    l = len(T)
    i = 0
    while True:
        h = hash(1046527,key,i)
        if(T[h] == key):
            return h
        elif(T[h] is None or h >= l):
            return -1
        else:
            i += 1

def find(T, key):
    a = search(T,key)
    if(a == -1):
        print('no')
    else:
        print('yes')

dict = {'A' : '1', 'C' : '2', 'G' : '3', 'T' : '4'}
data = []
T = [None]*1046527
n = int(input())


while n > 0:
    st = input()
    d = list(st.split())

### convert key to num(1~4)
    tmp_key = ''
    for x in list(d[1]):
        tmp_key += dict[x]

    data.append([d[0],int(tmp_key)])
    n -= 1
for com in data:
    if(com[0] == 'insert'):
        insert(T,com[1]) 
    else:
        find(T,com[1])
### BUGGY CODE ###

a, b, c, k = map(int, input().split())
total = 0

while k > 0:
    if a > 0:
        total += 1
        a -= 1
        k -= 1
        continue
    if b > 0:
        b -= 1
        k -= 1
        continue
    if c > 0:
        total -= 1
        k -= 1
        continue
print(total)


### FIXED CODE ###

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

total = 0

if a > 0:
    if a < k:
        total += a
        k -= a
    else:
        total += k
        print(total)
        k = 0

if b > 0 and k > 0:
    if b < k:
        k -= b
    else:
        print(total)
        k = 0

if c > 0 and k > 0:
    if c < k:
        total -= c
        print(total)
    else:
        total -= k
        print(total)
### BUGGY CODE ###

s = [ord(c) - 97 for c in input()]
t = [ord(c) - 97 for c in input()]
sl = len(s)
tl = len(t)
rr = [[0] * (tl) for _ in range(sl)]
t0 = t[0]

# init
for i in range(sl):
    if s[i] == t0:
        for k in range(i,sl):
            rr[k][0] = 1
        break

rr0 = rr[0]
s0 = s[0]
for j in range(tl):
    if s0 == t[j]:
        for k in range(j,tl):
            rr0[k] = 1
        break

# solve
ta = [(i,t[i]) for i in range(1, tl)]
for i in range(1, sl):
    rri = rr[i]
    rri1 = rr[i-1]
    si = s[i]
    for j, tj in ta:
        if si == tj:
            rri[j] = rri1[j-1] + 1
        else:
            rri[j] = rri1[j]
            if rri[j] < rri[j-1]:
                rri[j] = rri[j-1]

# restore
i = sl-1
j = tl-1
r = []
while i >= 0 and j >= 0:
    if s[i] == t[j]:
        r.append(s[i] + 97)
        i -= 1
        j -= 1
        continue
    if rr[i][j] == 0:
        break
    if i > 0 and rr[i-1][j] == rr[i][j]:
        i -= 1
    else:
        j -= 1

print(''.join(map(chr,r[::-1])))

"""
https://atcoder.jp/contests/dp/submissions/3972219
より。

愚直な実装で、エッジケース考え始めると大変そうだが…？
numpyと比べてオーバーヘッドが少なくs,tの小さいテストケースでは早い。
"""


### FIXED CODE ###

import numpy as np

t = np.array(list(input()), dtype='U1')
s = np.array(list(input()), dtype='U1')

ls = len(s)
lt = len(t)

eq = s[:, None] == t[None, :]
dp = [np.zeros(lt+1, dtype=np.int16)]

# solve
for i in range(ls):
    prev = dp[-1].copy()
    np.maximum(prev[1:], prev[:-1] + eq[i], out = prev[1:])
    np.maximum.accumulate(prev, out = prev)
    dp.append(prev)

# print([list(line) for line in dp])

# restore
l = dp[-1][-1]
res = ''
i, j = ls, lt
while i > 0 and j > 0:
    if eq[i-1][j-1]:
        res += s[i-1]
        i, j = i-1, j-1
        continue
    
    if dp[i-1][j] > dp[i][j-1]:
        i -= 1
    else:
        j -= 1

print(res[::-1])
### BUGGY CODE ###

def main():
    N, W = map(int, input().split())
    wl = []
    vl = []
    for _ in range(N):
        w, v = map(int, input().split())
        wl.append(w)
        vl.append(v)
    dp = [[0] * (W + 1) for _ in range(N + 1)]
    for i in range(N):
        for j in range(W + 1):
            if wl[i] > j:
                dp[i + 1][j] = dp[i][j]
            else:
                dp[i + 1][j] = max(dp[i][j], dp[i][j - wl[i]] + vl[i])
    print(dp[N][W])


main()


### FIXED CODE ###

def main():
    N, W = map(int, input().split())
    WV = []
    for _ in range(N):
        w, v = map(int, input().split())
        WV.append((w, v))
    dp = [[0] * (W + 1) for _ in range(N + 1)]
    for i in range(N):
        for j in range(W + 1):
            if j >= WV[i][0]:
                dp[i + 1][j] = max(
                    dp[i][j],
                    dp[i][j - WV[i][0]] + WV[i][1]
                )
            else:
                dp[i + 1][j] = dp[i][j]
    print(dp[-1][-1])


main()
### BUGGY CODE ###

from collections import deque
 
h, w = map(int, input().split())
s = [input() for i in range(h)]
 
d = [[h+w for j in range(w)] for i in range(h)]
que = deque()
 
#黒だったらスタートキューに入れる
for i in range(h):
  for j in range(w):
    if s[i][j]=='#':
        que.append((i, j))
        d[i][j] = 0
 
dx = [1, 0, -1, 0]
dy = [0, 1, 0, -1]
 
 
while que:
    p = que.popleft()
    # 黒にする4方向をループ
    for i in range(4):
        nx = p[1] + dx[i]
        ny = p[0] + dy[i]
 
        if (0<=nx<w) and (0<=ny<h) and (d[ny][nx]==h+w):
            que.append((ny, nx))
            d[ny][nx] = d[p[0]][p[1]] + 1
 
res = max(map(max, d))
print(res)

### FIXED CODE ###

from collections import deque
 
h, w = map(int, input().split())
s = [input() for i in range(h)]
 
d = [[h+w for j in range(w)] for i in range(h)]
que = deque()
 
#黒だったらスタートキューに入れる
for i in range(h):
  for j in range(w):
    if s[i][j]=='#':
        que.append((i, j))
        d[i][j] = 0
 
dx = [1, 0, -1, 0]
dy = [0, 1, 0, -1]
 
 
while que:
    p = que.popleft()
    # 黒にする4方向をループ
    for i in range(4):
        nx = p[1] + dx[i]
        ny = p[0] + dy[i]
 
        if (0<=nx<w) and (0<=ny<h) and (d[ny][nx]==h+w):
            que.append((ny, nx))
            d[ny][nx] = d[p[0]][p[1]] + 1
 
res = max(map(max, d))
print(res)
### BUGGY CODE ###

N = int(input())

left = []
for h in range(1,3500):
    left.append(4/N-1/h)

left.sort()

import bisect
ans = [0,0,0]
flag = 0
for n in range(1,3500):
    if flag == 1:
        break
    for w in range(1,3500):
        temp = 1/n + 1/w
        index = bisect.bisect_left(left, temp)
        if index < len(left) and left[index] == temp:
            ans[1] = n
            ans[2] = w
            flag = 1
            break

n = ans[1]
w = ans[2]
h = N*n*w // (4*n*w - N*w - N*n)

print('{} {} {}'.format(h,n,w))



### FIXED CODE ###

N = int(input())

flag = 0
for n in range(1,3500):
    if flag == 1:
        break
    for w in range(1,3500):
        if (4*n*w - N*w - N*n) == 0:
            continue
        h = N*n*w / (4*n*w - N*w - N*n)
        if h%1 == 0 and 1 <= h <= 3500:
            flag = 1
            break

print('{} {} {}'.format(int(h), n-1, w))
### BUGGY CODE ###

N = int(input())
import numpy as np
#max=int(np.sqrt(N))
for n in range(1,N+1):
    j=0
    max = int(np.sqrt(abs(n-2)))
    #print(max)
    for x in range(1,max):
        for y in range(1, max):
            for z in range(1, max):
                if x**2+y**2+z**2+x*y+y*z+z*x==n:
                    #print(x, y, z)
                    #print(f'n:{n}')
                    j+=1
    print(j)

### FIXED CODE ###

n = int(input())
ans = [0 for _ in range(10050)]
for i in range(1,105):
	for j in range(1,105):
		for k in range(1,105):
			v = i*i+j*j+k*k+i*j+j*k+k*i;
			if v<10050:
				ans[v]+=1

for i in range(n):
  	print(ans[i+1])
### BUGGY CODE ###

n = int(input())
a = []

for i in range(n):
    s = input()
    if not s in a:
        a.append(s)

print(len(a))

### FIXED CODE ###

import collections
n = int(input())
s = [input() for i in range(n)]
c = collections.Counter(s)
print(len(c))
### BUGGY CODE ###

# encoding: "utf-8"

class Stdin:
    @staticmethod
    def read_line(converter=str):
        return [converter(x) for x in input().split()]
    
    @staticmethod
    def read_lines(n, converter=str):
        result = list()
        for _ in range(n):
            result.append(Stdin.read_line(converter))
        return result
    
    @staticmethod
    def convert(data, converter):
        assert(len(data) == len(converter))
        return tuple(map(lambda x, f: f(x), data, converter))

    @staticmethod
    def convert_lines(datas, n, converter):
        return [converter(data, n, converter) for data in datas]


def main():
    _ = input()
    xs = Stdin.read_line(converter=int)
    ys = [[x-1, x, x+1] for x in xs]
    zs = list()
    for y in ys:
        zs.extend(y)
    zs.sort()
    counts = [zs.count(i) for i in range(max(zs))]   
    print(max(counts))

if __name__ == "__main__":
    main()

### FIXED CODE ###

input()
a_list = [int(s) for s in input().split()]

count = [0]*100002

for a in a_list:
    count[a] += 1
    count[a+1] += 1
    count[a+2] += 1
    
print(max(count))
### BUGGY CODE ###

n, k = map(int, input().split())
a = list(map(int, input().split()))

a_spec = set(a) #aの種類

b = []
for i in a_spec:
  b.append(a.count(i))

b.sort()

d = len(a_spec) - k #減らす数字の種類
print(sum(b[0:d]))

### FIXED CODE ###

n, k = map(int, input().split())

from collections import Counter
c = Counter(list(map(int, input().split())))

#Counterからの取り出し
l = []
m = []
for x, y in c.items():
    l += [y]
    m += [x]

L = sorted(l)
M = len(m)

cnt = 0 
if M <= k:
    print(0)
else:
    for i in range(M-k):
        cnt += L[i]
    print(cnt)
### BUGGY CODE ###

S = input()
K = int(input())
N = len(S)

al = [chr(ord('a') + i) for i in range(26)]
tmp_al = []
if K==1:
    for s in al:
        if s in S:
            print(s)
            exit()

for s in al:
    if s in S:
        if len(tmp_al) == 3:
            break
        if N - S.rfind(s) >= K:
            tmp_al.append(s)
            break
        else:
            if N - S.find(s) >= K:
                tmp_al.append(s)
                break
            else:
                tmp_al.append(s)
                continue

count = [[] for _ in range(len(tmp_al))]
for i in range(len(tmp_al)):
    for k in range(N):
        if S[k] == tmp_al[i]:
            count[i].append(k)
ans_list = []
ans_list.append(tmp_al[0])
for i in count[0]:
    cnt = 1
    if cnt == 6:
        continue
    while (i + cnt <= N):
        ans_list.append(S[i:i+cnt])
        cnt += 1
ans_list = list(set(ans_list))

if len(ans_list) < K:
    for i in count[1]:
        cnt = 1
        if cnt == 6:
            continue
        while (i + cnt <= N):
            ans_list.append(S[i:i+cnt])
            cnt += 1
ans_list = list(set(ans_list))

if len(ans_list) < K:
    for i in count[2]:
        cnt = 1
        while i + cnt <= N:
            ans_list.append(S[i:i+cnt])
            cnt += 1
ans_list = list(set(ans_list))


ans_list.sort()
##print(ans_list)
print(ans_list[K-1])

### FIXED CODE ###

S = input()
K = int(input())
N = len(S)

al = [chr(ord('a') + i) for i in range(26)]
tmp_al = []
if K==1:
    for s in al:
        if s in S:
            print(s)
            exit()

for s in al:
    if s in S:
        if len(tmp_al) == 3:
            break
        if N - S.rfind(s) >= K:
            tmp_al.append(s)
            break
        else:
            if N - S.find(s) >= K:
                tmp_al.append(s)
                break
            else:
                tmp_al.append(s)
                continue

count = [[] for _ in range(len(tmp_al))]
for i in range(len(tmp_al)):
    for k in range(N):
        if S[k] == tmp_al[i]:
            count[i].append(k)
ans_list = []
ans_list.append(tmp_al[0])
for i in count[0]:
    cnt = 1
    while (i + cnt <= N):
        if cnt == 7:
            break
        ans_list.append(S[i:i+cnt])
        cnt += 1

ans_list = list(set(ans_list))

if len(ans_list) < K:
    for i in count[1]:
        cnt = 1
        while (i + cnt <= N):
            if cnt == 7:
                break
            ans_list.append(S[i:i+cnt])
            cnt += 1
ans_list = list(set(ans_list))

if len(ans_list) < K:
    for i in count[2]:
        cnt = 1
        while i + cnt <= N:
            ans_list.append(S[i:i+cnt])
            cnt += 1
ans_list = list(set(ans_list))


ans_list.sort()
##print(ans_list)
print(ans_list[K-1])
### BUGGY CODE ###

N = int(input())
As = list(map(bool, map(int, input().split())))
As.insert(0, False)
Ans = [False for _ in range(N + 1)]
Ans[N] = As[N]
for i in range(N - 1, 0, -1):
    p = i * 2
    s = False
    while p <= N:
        s ^= Ans[p]
        p += i
    Ans[i] = s ^ As[i]
M = sum(Ans)
print(M)
if M > 0:
    bs = ""
    for i in range(1, N + 1):
        if Ans[i]:
            bs += "%d " % i
    bs = bs.rstrip(" ")
    print(bs)

### FIXED CODE ###

N = int(input())
As = list(map(bool, map(int, input().split())))
As.insert(0, False)
Ans = [False for _ in range(N + 1)]
Ans[N] = As[N]
for i in range(N - 1, 0, -1):
    p = i * 2
    s = False
    while p <= N:
        s ^= Ans[p]
        p += i
    Ans[i] = s ^ As[i]
M = sum(Ans)
print(M)
if M > 0:
    c = True
    for i in range(1, N + 1):
        if Ans[i]:
            if c:
                c = False
            else:
                print(" ", end="")
            print(i, end="")
    print("")
### BUGGY CODE ###

n = int(input())
count = 0
for i in range(1, n):
  for j in range(1, n):
    if i * j <= n-1:
      count += 1
    else:
      break
print(count)

### FIXED CODE ###

n = int(input())
count = 0
for i in range(1, n):
  for j in range(1, n):
    if i * j <= n-1:
      count += 1
    else:
      break
print(count)