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

n = int(input())
s = []
for _ in range(n):
    s.append(input())

count = 0
for i in range(n):
    for j in range(i+1, n):
        char_i = [0 for _ in range(26)]
        char_j = [0 for _ in range(26)]
        for c in s[i]:
            char_i[ord(c) - 97] += 1
        for c in s[j]:
            char_j[ord(c) - 97] += 1
        if char_i == char_j:
            count += 1

print(count)


### FIXED CODE ###

n = int(input())
s_list = []
for _ in range(n):
    s_list.append(''.join(sorted(input())))

s_list = sorted(s_list)

count = 0
total = 0
s_prev = s_list[0]
for s in s_list[1:]:
    if s_prev == s:
        count += 1
    else:
        if count > 0:
            total += count * (count + 1) // 2
            count = 0
    s_prev = s

if count > 0:
    total += count * (count + 1) // 2

print(total)
### BUGGY CODE ###

#!/usr/bin/env python3
n = int(input()) 
A = list(map(int, input().split()))
i = 10 ** 18
ans = 1
for a in A:
    ans = ans * a
if ans > i:
    print(-1)
else:
    print(ans)

### FIXED CODE ###

#!/usr/bin/env python3
n = int(input()) 
A = list(map(int, input().split()))
b = 1
i = 10**18
A = sorted(A)
for a in A:
  if b > i:
    break
  b *= a
print(-1 if b > i else b)
### BUGGY CODE ###

N = int(input())
A = list(map(float, input().split()))
def solve():
    dp = [[[0]*(N+1-i-j) for j in range(N+1-i)] for i in range(N+1)]
    dp[N][0][0] = 0
    for i in range(N-1,-1,-1):
        for j in range(N-i,-1,-1):
            for k in range(N-i-j,-1,-1):
                dp[i][j][k] = 1/(1-i/N)
                if j != 0:
                    dp[i][j][k] += dp[i+1][j-1][k]*(j/(N-i))
                if k != 0:
                    dp[i][j][k] += dp[i][j+1][k-1]*(k/(N-i))
                if i+j+k != N:
                    dp[i][j][k] += dp[i][j][k+1]*(1-(j+k)/(N-i))
    c = {}
    for i in range(1,3):
        c[i] = A.count(i)
    ans = dp[0][c[1]][c[2]]
    # print(*dp,sep='\n')
    return ans
print(solve())

### FIXED CODE ###

N = int(input())
A = list(map(float, input().split()))
def solve():
    dp = [[[0]*(N+1-i-j) for j in range(N+1-i)] for i in range(N+1)]
    dp[N][0][0] = 0
    for i in range(N-1,-1,-1):
        for j in range(N-i,-1,-1):
            for k in range(N-i-j,-1,-1):
                dp[i][j][k] = 1/(1-i/N)
                if j != 0:
                    dp[i][j][k] += dp[i+1][j-1][k]*(j/(N-i))
                if k != 0:
                    dp[i][j][k] += dp[i][j+1][k-1]*(k/(N-i))
                if i+j+k != N:
                    dp[i][j][k] += dp[i][j][k+1]*(1-(j+k)/(N-i))
    c = {}
    for i in range(1,3):
        c[i] = A.count(i)
    ans = dp[0][c[1]][c[2]]
    # print(*dp,sep='\n')
    return ans
print(solve())
### BUGGY CODE ###

s = list(input())
n = len(s)
c = n-1
ans = 0
while True:
    if c <2:
        break
    if s[c-2]+s[c-1]+s[c]=="ABC":
        ans += 1
        s[c-2]="B"
        s[c-1]="C"
        s[c]="A"
        if c+2 < n:
            c +=2
    else:
        if s[c-1] !="C":
            c -=2
        else:
            c -=1

print(ans)

### FIXED CODE ###

S = input()
S = S.replace("BC","D")

ans = 0
a = 0
for s in S:
    if s =="A":
        a += 1
    elif s =="D":
        ans += a
    else:
        a = 0

print(ans)
### BUGGY CODE ###

from sys import stdin 
from collections import defaultdict 


N, P = map(int, stdin.readline().split())
S, = stdin.readline().split()


tens_mod = []
count = 1
for i in range(N - 1):
	count *= 10 % P 
	tens_mod.append(count)

ans = 0
# dp: length/right pos index
dp = defaultdict(lambda:[0]*N)
for i in range(N):
	x = int(S[i])
	dp[1][i] = x % P
	if x % P == 0:
		ans += 1

# length of segment
for i in range(2, N + 1):
	# right pos index 
	for j in range(i - 1, N):
		x = (dp[i - 1][j - 1]*10 + dp[1][j]) % P
		if x == 0:
			ans += 1
		dp[i][j] = x

print (ans)





### FIXED CODE ###

from sys import stdin 
from collections import defaultdict, Counter


N, P = map(int, stdin.readline().split())
S, = stdin.readline().split()

ans = 0 


# 2 cases
if P == 2 or P == 5:
	digitdiv = []
	for i in range(N):
		if int(S[i]) % P == 0:
			ans += i + 1

else:
	#
	count = Counter()
	prefix = []
	ten = 1
	mod = 0
	for i in range(N):
		x = (int(S[N - i - 1])*ten + mod) % P 
		prefix.append(x)
		count[x] += 1
		ten = (ten * 10) % P 
		mod = x
	prefix.append(0)
	count[0] += 1
	for val in count.values():
		ans += val*(val - 1)//2


print (ans)
### BUGGY CODE ###

import sys
readline = sys.stdin.readline

from heapq import *

def solve():
    N, K = map(int, readline().split())
    A = list(map(int ,readline().split()))

    A.sort()

    B = [(-a, 1) for a in A]

    heapify(B)

    for i in range(K):
        b, n = heappop(B)
        heappush(B, (b * n / (n + 1), n + 1))

    ans = -min(B)[0]
    if ans != int(ans):
        print(int(1 + ans))
    else:
        print(ans)

solve()

### FIXED CODE ###

import sys
readline = sys.stdin.readline
 
N, K = map(int, readline().split())
A = list(map(int, readline().split()))
 
l = 0
r = 10**10
 
def test(m):
  return sum((a + m - 1) // m for a in A) - N <= K

while l + 1 < r:
  m = (l + r) // 2
  if test(m):
  	r = m
  else:
    l = m
print(r)
### BUGGY CODE ###

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

dp=[[0]*(n+1) for i in range(n+1)]
ans=0

for i in range(1,n):
    for j in range(i+1,n+1):
        if s[n-i]==s[n-j]:
            dp[n-i][n-j]=min((n-i)-(n-j),dp[n-i+1][n-j+1]+1)
            ans=max(dp[n-i][n-j],dp[n-i+1][n-j+1])
        else:
            pass
print(ans)
        


        
            
        
            
            

            
            




### FIXED CODE ###

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

dp=[[0]*(n+1) for i in range(n+1)]
ans=0

for i in range(1,n):
    for j in range(i+1,n+1):
        if s[n-i]==s[n-j]:
            dp[n-i][n-j]=min((n-i)-(n-j),dp[n-i+1][n-j+1]+1)
            ans=max(dp[n-i][n-j],ans)
        else:
            pass
print(ans)
### BUGGY CODE ###

N = int(input())
A = list(map(int,input().split()))
B = list(map(int,input().split()))
C = list(map(int,input().split()))
A = sorted(A)
B = sorted(B)
C = sorted(C)
answer = 0
for i in range(N) :
    for j in range(N) :
        if A[i] >= max(B) :
            continue
        elif A[i] < B[j] :
            for k in range(N) :
                if B[j] >= max(C) :
                    continue
                elif B[j] < C[k] :
                    answer += N-(k+1)+1
                    break
print(answer)
      

### FIXED CODE ###

import bisect
def main() :
    N = int(input())
    A = list(map(int,input().split()))
    B = list(map(int,input().split()))
    C = list(map(int,input().split()))
    A.sort()
    B.sort()
    C.sort()
    answer = 0
    for b in B :
        i = bisect.bisect_left(A,b)
        j = bisect.bisect_right(C,b)
        if i > 0 and j != len(C) :
            answer += i * (N-j)
    print(answer)
main()
### BUGGY CODE ###

S = list(input())
Q = int(input())
query = [input().split() for i in range(Q)]
for i in query:
    if i[0] == '1':
        S = list(reversed(S))
    elif i[0]=='2' and i[1]=='1':
        S.insert(0, i[2])
    elif i[0]=='2' and i[1]=='2':
        S.append(i[2])
print(''.join(S))

### FIXED CODE ###

from collections import deque

S = list(input())
S = deque(S)
Q = int(input())
reverse = 1
query = [input().split() for i in range(Q)]
for i in query:
    if len(i) == 1:
        reverse *= -1
    elif (i[1]=='1' and reverse == 1) or (i[1]=='2' and reverse==-1):
        S.appendleft(i[2])
    else:
        S.append(i[2])
if reverse == -1:
   S.reverse() 
print(''.join(list(S)))
### BUGGY CODE ###

import bisect
from operator import itemgetter
import math
import functools
import itertools
import numpy as np
import sys
MAX_INT = int(10e10)
MIN_INT = -MAX_INT
mod = 1000000007
sys.setrecursionlimit(1000000)
def IL(): return list(map(int,input().split()))
def SL(): return input().split()
def I(): return int(sys.stdin.readline())
def S(): return input()

def tamiL(x,y,n):
  if (0 <= x < W) and (0 <= y < H):
    if grid[y][x] == ".":
      return tamiL(x-1,y,n+1)
    else:
      return n
  else:
    return n

def tamiR(x,y,n):
  if (0 <= x < W) and (0 <= y < H):
    if grid[y][x] == ".":
      return tamiR(x+1,y,n+1)
    else:
      return n
  else:
    return n

def tamiU(x,y,n):
  if (0 <= x < W) and (0 <= y < H):
    if grid[y][x] == ".":
      return tamiU(x,y-1,n+1)
    else:
      return n
  else:
    return n

def tamiD(x,y,n):
  if (0 <= x < W) and (0 <= y < H):
    if grid[y][x] == ".":
      return tamiD(x,y+1,n+1)
    else:
      return n
  else:
    return n

H,W = IL()
grid = [[i for i in S()] for i in range(H)]

ans = 0
for i in range(H):
  for j in range(W):
    if grid[i][j] == ".":
      cnt = 0
      cnt += tamiL(j-1,i,0)
      cnt += tamiR(j+1,i,0)
      cnt += tamiU(j,i-1,0)
      cnt += tamiD(j,i+1,0)
      ans = max(ans,cnt+1)

print(ans)

### FIXED CODE ###

H,W = list(map(int,input().split()))
grid = [[i for i in input()] for i in range(H)]
cntH = [[0 for i in range(W)] for i in range(H)]
cntW = [[0 for i in range(W)] for i in range(H)]

for h in range(H):
  cnt = 0
  for w in range(W):
    if grid[h][w] == "#":
      cnt = 0
    else:
      cnt += 1
      cntW[h][w] = cnt

for h in range(H-1,-1,-1):
  cnt = 0
  for w in range(W-1,-1,-1):
    if grid[h][w] == "#":
      cnt = 0
    elif cnt == 0:
      cnt = cntW[h][w]
    else:
      cntW[h][w] = cnt

for w in range(W):
  cnt = 0
  for h in range(H):
    if grid[h][w] == "#":
      cnt = 0
    else:
      cnt += 1
      cntH[h][w] = cnt

for w in range(W-1,-1,-1):
  cnt = 0
  for h in range(H-1,-1,-1):
    if grid[h][w] == "#":
      cnt = 0
    elif cnt == 0:
      cnt = cntH[h][w]
    else:
      cntH[h][w] = cnt

ans = 0
for h in range(H):
  for w in range(W):
    ans = max(ans,cntW[h][w]+cntH[h][w])

print(ans-1)
### BUGGY CODE ###

n, p = map(int, input().split())
m = int(p**(1/n)) + 1

for i in range(m, 0, -1):
    if p%(i**n) == 0:
        print(i)
        exit()

### FIXED CODE ###

n, p = map(int, input().split())
l = []
ans = 1

for i in range(2, int(p**0.5) + 2):
    if p%i == 0:
        cnt = 0
        while p%i == 0:
            p /= i
            cnt += 1
        l.append([i, cnt])

if p != 1:
    l.append([p, 1])

for i, j in l:
    while j >= n:
        ans *= i
        j -= n

print(int(ans))
### BUGGY CODE ###

I=lambda:list(map(int,input().split()));x,y,z,k=I();s=lambda a,b:sorted(i+j for i in a for j in b)[-k:];print(*s(s(I(),I()),I())[::-1])

### FIXED CODE ###

I=lambda:list(map(int,input().split()));x,y,z,k=I();s=lambda a,b:sorted(i+j for i in a for j in b)[:-k-1:-1];print(*s(s(I(),I()),I()))
### BUGGY CODE ###

import math
from sys import stdin,stdout
#% 998244353
from heapq import heapify,heappop,heappush
import collections

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


for i in range(k):
    nw=[0]*n
    for x,d in enumerate(a):
        l=x-d-0.5
        r=x+d+0.5

        for p in range(n):
            if p>=l and p<=r:
                nw[p]+=1
    f=1
    for i in range(n):
        if a[i]==nw[i]:
            f=1
        else:
            f=0
            break
    if f:
        break
    a[:]=nw

for i in a:
    print(i,end=" ")

### FIXED CODE ###

import math
from sys import stdin,stdout
#% 998244353
from heapq import heapify,heappop,heappush
import collections

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


for i in range(min(k,100)):
    #nw=[0]*n
    pr=[0]*n
    for x,d in enumerate(a):
        if d==0:
            pr[x]+=1
            if x!=n-1:
                pr[x+1]-=1
            continue
        l=math.floor(x-d)
        r=math.floor(x+d)
        l=max(0,l)
        r=min(n-1,r)
        pr[l]+=1
        if r!=n-1:
            pr[r+1]-=1
    
    for m in range(1,n):
        pr[m]+=pr[m-1]
    
    a[:]=pr


        

for i in a:
    print(i,end=" ")
### BUGGY CODE ###

from collections import Counter
"""素因数分解"""
def prime_decomposition(n):
    i = 2
    tank = []
    while i * i <= n:
        while n%i == 0:
            n /= i
            tank.append(i)
        i += 1
    if n > 1:
        tank.append(int(n))
    return dict(Counter(tank))

def main():
    n = int(input())
    A = list(map(int,input().split()))
    mod = 10**9 + 7
    dct = {}
    for a in A:
        tmp = prime_decomposition(a)
        for k, v in tmp.items():
            if k not in dct.keys():
                dct[k] = v
            else:
                if v > dct[k]:
                    dct[k] = v
    l = 1
    for k,v in dct.items():
        l *= k**v
    res = 0
    for a in A:
        res += l//a
    print(res % mod)

if __name__ == '__main__':
    main()

### FIXED CODE ###

import functools
"""最大公約数"""
def gcd(a,b):
    import fractions
    return fractions.gcd(a,b)

"""最小公倍数"""
def lcm(a,b):
    f = gcd(a,b)
    return a*b//f

def m(nums):
    return functools.reduce(lcm, nums)

def main():
    n = int(input())
    A = list(map(int,input().split()))
    mod = 10**9+7
    l = m(A)
    res = 0
    print(sum(l// i for i in A) % mod)

if __name__ == '__main__':
    main()
### BUGGY CODE ###


import sys
input = sys.stdin.readline

n = int(input())
b = list(map(int, input().split()))

from queue import Queue
q = Queue()
ans = Queue()

import numpy as np
n = np.array(n)


def bfs(b):
    q.put(b)
    ans.put([])

    while q.empty() == False:
        p = q.get()
        a = ans.get()

        if p == []:
            break

        if p[0] != 1:
            continue

        for i, pp in enumerate(p):
            if pp == i+1:
                q.put(p[:i]+p[i+1:])
                ans.put(a+[i+1])


    if p == []:
        a = a[::-1]
        for aa in a:
            print(aa)
    else:
        print(-1)


bfs(b)


### FIXED CODE ###

import sys
input = sys.stdin.readline

n = int(input())
b = list(map(int, input().split()))

from queue import Queue
q = Queue()
ans = Queue()

import numpy as np
n = np.array(n)


def bfs(b):
    q.put(b)
    ans.put([])

    while q.empty() == False:
        p = q.get()
        a = ans.get()

        if p == []:
            break

        if p[0] != 1:
            continue

        m = len(p)

        for i in range(m-1, -1, -1):
            if p[i] == i+1:
                q.put(p[:i]+p[i+1:])
                ans.put(a+[i+1])
                break


    if p == []:
        a = a[::-1]
        for aa in a:
            print(aa)
    else:
        print(-1)


bfs(b)
### BUGGY CODE ###

n = int(input())
li = list(map(int, input().split()))
li1 = []

for i in range(n):
    li2 = li[:i]
    li2.extend(li[i+1:])
    li1.append(li2)

for i in range(n):
    li1[i].sort()
    print(li1[i][(n-1)//2])



### FIXED CODE ###

n = int(input())
li = list(map(int, input().split()))

li1 = sorted(li)
p = li1[n//2]
q = li1[n//2-1]

for i in li:
    if i <= q:
        print(p)
    else:
        print(q)
### BUGGY CODE ###

import sys
import math
from collections import defaultdict

sys.setrecursionlimit(10**7)
def input():
    return sys.stdin.readline()[:-1]

mod = 10**9 + 7

def I(): return int(input())
def II(): return map(int, input().split())
def III(): return list(map(int, input().split()))
def Line(N):
    read_all = [tuple(map(int, input().split())) for _ in range(N)]
    return map(list,zip(*read_all))

#################

from bisect import bisect_right

N,M,Q = II()
x = []
for i in range(M):
    L,R = II()
    x.append([L-1, R-1])
p,q = Line(Q)


x.sort(key = lambda x:x[1])

y = [[float('inf')]*M for _ in range(N)]
c = [0]*N
for i in range(M):
    for j in range(x[i][0]+1):
        y[j][c[j]] = x[i][1]
        c[j] += 1

ans = 0
for i in range(Q):
    print(bisect_right(y[p[i]-1], q[i]-1))

### FIXED CODE ###

import sys
import math
from collections import defaultdict

sys.setrecursionlimit(10**7)
def input():
    return sys.stdin.readline()[:-1]

mod = 10**9 + 7

def I(): return int(input())
def II(): return map(int, input().split())
def III(): return list(map(int, input().split()))
def Line(N):
    read_all = [tuple(map(int, input().split())) for _ in range(N)]
    return map(list,zip(*read_all))

#################

N,M,Q = II()
x = []
for i in range(M):
    L,R = II()
    x.append([L-1, R-1])

p = [0]*Q
q = [0]*Q
for i in range(Q):
    p0,q0 = II()
    p[i] = p0-1
    q[i] = q0-1

a = [[0]*N for _ in range(N)]
for i in range(M):
    a[x[i][0]][x[i][1]] += 1

c = [[0]*N for _ in range(N)]
for i in range(N):
    for j in range(N):
        if j==0:
            temp = 0
        else:
            temp = c[i][j-1]
        c[i][j] = temp + a[i][j]

for i in range(Q):
    ans = 0
    for j in range(p[i],q[i]+1):
        ans += c[j][q[i]]
    print(ans)
### BUGGY CODE ###

N = int(input())
A = sorted([int(input()) for i in range(N)])
ans1 = [A[N-1]]
ans2 = [A[0]]

f = 0
b = N - 2
s = True
while f <= b:
    if s:
        ans1 = ans1 + [A[f]]

        f += 1
        if f <= b:
            ans1 = [A[f]] + ans1
            f += 1
    else:
        ans1 = ans1 + [A[b]]
        b -= 1
        if f <= b:
            ans1 = [A[b]] + ans1
            b -= 1
    s = not s

f = 1
b = N - 1
s = True
while f <= b:
    if s:
        
        ans2 = ans2 + [A[b]]
        b -= 1
        if f <= b:
            ans2 = [A[b]] + ans2
            b -= 1
    else:
        ans2 = ans2 + [A[f]]
        f += 1
        if f <= b:
            ans2 = [A[f]] + ans2
            f += 1

a1 = a2 = 0
for i in range(N-1):
    a1 += abs(ans1[i] - ans1[i+1])

for i in range(N-1):
    a2 += abs(ans2[i] - ans2[i+1])

print(max(a1,a2))

### FIXED CODE ###

N = int(input())
A = sorted([int(input()) for i in range(N)])

a = [0] * N
b = [0] * N
j = 1

for i in range(N-1):    
    a[i] += -j
    a[i+1] += j
    b[i] += j
    b[i+1] += -j    
    j = -j

a.sort()
b.sort()
s1 = sum([i*j for i,j in zip(a, A)])
s2 = sum([i*j for i,j in zip(b, A)])
print(max(s1,s2))
### BUGGY CODE ###

from math import factorial

h, w, a, b = map(int, input().split(' '))
# MAX = max(h, w)
MOD = 10**9 + 7
MAX = 10**6


def modpow(a, b):
    res = 1
    while b:
        if (b & 1):
            res = (res * a) % MOD
        a = (a * a) % MOD
        b >>= 1
    return res


def nCr(n, r):
    if r == 0 or n == r:
        return 1
    return (((f[n] * ivf[n-r]) % MOD) * ivf[r]) % MOD


f = [1] * MAX
ivf = [0] * MAX
for i in range(1, MAX):
    f[i] = (f[i-1] * i) % MOD
    ivf[i] = modpow(f[i], MOD-2)
r = 0
for i in range(b, w):
    y1 = h - a - 1
    x1 = i
    y2 = a - 1
    x2 = w - i - 1
    p = (nCr(x1 + y1, x1) * nCr(x2 + y2, x2)) % MOD
    r = (r + p) % MOD
print(int(r))


### FIXED CODE ###

from array import *
import time
h, w, a, b = map(int, input().split(' '))
MOD = 10**9 + 7
MAX = max(h+w-a-1, a+w)


def modpow(a, b):
    res = 1
    while b:
        if (b & 1):
            res = (res * a) % MOD
        a = (a * a) % MOD
        b >>= 1
    return res


def nCr(n, r):
    if r == 0 or n == r:
        return 1
    return (((f[n] * ivf[n-r]) % MOD) * ivf[r]) % MOD


f = [1] * MAX
f = array('q', f)
ivf = [0] * MAX
ivf = array('q', ivf)
for i in range(1, MAX):
    f[i] = (f[i-1] * i) % MOD
    ivf[i] = modpow(f[i], MOD-2)
r = 0
for i in range(b, w):
    y1 = h - a - 1
    x1 = i
    y2 = a - 1
    x2 = w - i - 1
    p = (nCr(x1 + y1, x1) * nCr(x2 + y2, x2)) % MOD
    r = (r + p) % MOD
print(int(r))
### BUGGY CODE ###

import copy
N, W = map(int, input().split())

WV = [map(int,input().split()) for _ in range(N) ]


costs = [(0,0)]

for w, v in WV:
    new_costs = copy.deepcopy(costs)
    for cw, cv in costs:
        if cw + w > W:
            continue
        new_costs.append((cw + w, cv + v))
    costs = new_costs



print( max(costs,key=lambda item:item[1])[1])



### FIXED CODE ###

import copy
N, W = map(int, input().split())

WV = [map(int,input().split()) for _ in range(N) ]


#dp[w] = max cost
costs = [-1 for _ in range(W + 1)]
costs[0] = 0

for w, v in WV:
    for index in reversed(range(W + 1)):
        if costs[index] == -1:
            continue
        if index + w > W:
            continue
        costs[index + w] = max(costs[index] + v, costs[index + w])


print(max(costs))
### BUGGY CODE ###

N = int(input())
S = input()
Min = N
for i in range(N+1):
    cnt = S[:i].count("#") + S[i:].count(".")
    # print(S[:i].count("#") + S[i:].count("."))
    if Min > cnt:
        Min = cnt
print(Min)

### FIXED CODE ###

N = int(input())
S = input()
Min = N
siro = S.count(".")
kuro = S.count("#")
Min = min([siro, kuro])
siro_now = 0
for i in range(N):
    if S[i] == ".":
        siro_now += 1
    cnt = (((i+1)-siro_now) + (siro - siro_now))
    if Min > cnt:
        Min = cnt
print(Min)
### BUGGY CODE ###

import sys
sys.setrecursionlimit(3000)
def fact(i):
  if i<2:
    return 1
  return i*fact(i-1)

inf = input().split()
N = int(inf[0])
K = int(inf[1])
M = N-K
for i in range(1,K+1):
  red = fact(M+1)//(fact(i)*fact(M+1-i))
  blue = fact(K-1)//(fact(i-1)*fact(K-i))
  print(red*blue%(10**9+7))


### FIXED CODE ###

from operator import mul
from functools import reduce
 
def cmb(n,r):
    r = min(n-r,r)
    if r==0: return 1
    over = reduce(mul, range(n, n - r, -1))
    under = reduce(mul, range(1,r + 1))
    return over // under

inf = input().split()
N = int(inf[0])
K = int(inf[1])
M = N-K
for i in range(1,K+1):
  if M+1<i:
    red = 0
  else:
    red = cmb(M+1,i)
  blue = cmb(K-1,i-1)
  print(red*blue%(10**9+7))
### BUGGY CODE ###

s = input()
k = int(input())

a = list(s)
a = [ord(i) for i in a]
m = 0
c = []
INF = 97+26
while len(c) < k:
    m = min(a, key=lambda x: x if x > m else INF)
    a1 = [i for i in range(len(s)) if a[i] == m]
    for i in a1:
        j = 0
        while i+j < len(s):
            if s[i:i+j+1] not in c:
                c.append(s[i:i+j+1])
            j += 1

c.sort()
print(c[k-1])


### FIXED CODE ###

s = input()
k = int(input())

a = list(s)
a = [ord(i) for i in a]
b = sorted(set(a))
c = []
INF = 97+26
for m in b:
    a1 = [i for i in range(len(s)) if a[i] == m]

    for i in a1:
        j = 0
        for j in range(k):
            if s[i:i+j+1] not in c:
                c.append(s[i:i+j+1])
                c.sort()
            if len(c) > 5:
                del c[-1]
            j += 1
            if i + j >= len(s):
                break
    if len(c) >= k:
        break

print(c[k-1])
### BUGGY CODE ###

N,M = map(int,input().split())
LRD = [(lambda x: [int(x[0])-1,int(x[1])-1,int(x[2])])(input().split()) for _ in [0]*M]

connect = [[] for _ in range(N)]
for L,R,D in LRD:
    connect[L].append([R,D])
    connect[R].append([L,-D])

ans = True
n = [None] * N
q = []
n0 = 0
while ans:
    n[n0] = 0
    q.append(n0)
    for i in q:
        for j,d in connect[i]:
            if n[j] == None:
                n[j] = n[i] + d
                q.append(j)
            elif n[j]-n[i] != d:
                ans = False
                break
        if not ans:
            break
    for i in range(n0,N):
        if n[i] == None:
            n0 = i
            break
    else:
        break

if ans:
    print("Yes")
else:
    print("No")

### FIXED CODE ###

N,M = map(int,input().split())
LRD = [(lambda x: [int(x[0])-1,int(x[1])-1,int(x[2])])(input().split()) for _ in [0]*M]

connect = [[] for _ in range(N)]
for L,R,D in LRD:
    connect[L].append([R,D])
    connect[R].append([L,-D])

ans = True
n = [None] * N
n0 = 0
while ans:
    q = [n0]
    n[n0] = 0
    for i in q:
        for j,d in connect[i]:
            if n[j] == None:
                n[j] = n[i] + d
                q.append(j)
            elif n[j]-n[i] != d:
                ans = False
                break
        if not ans:
            break
    for i in range(n0,N):
        if n[i] == None:
            n0 = i
            break
    else:
        break

if ans:
    print("Yes")
else:
    print("No")