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

import sys
input = sys.stdin.readline

n, m = map(int, input().split())
a = []
for i in range(m):
    aa = int(input())
    if a:
        if a[-1] == aa - 1:
            print(0)
            exit()
    a.append(aa)
dp = [0] * (n + 1)
mod = 10 ** 9 + 7

dp[0] = 1
if not 1 in a:
    dp[1] = 1
for i in range(1, n):
    if i + 1 in a:
        dp[i + 1] = 0
    else:
        dp[i + 1] = (dp[i] + dp[i - 1]) % mod
print(dp[n])

### FIXED CODE ###

n, m = map(int, input().split())
dp = [0] * (n + 1)
a = []
for i in range(m):
    aa = int(input())
    dp[aa] = -1
    a.append(aa)
for i in range(m - 1):
    if a[i] + 1 == a[i + 1]:
        print(0)
        exit()
mod = 10 ** 9 + 7

dp[0] = 1
if 1 in a:
    dp[1] = 0
else:
    dp[1] = 1
for i in range(1, n):
    if dp[i + 1] == -1:
        dp[i + 1] = 0
    else:
        dp[i + 1] = (dp[i] + dp[i - 1]) % mod
print(dp[n])
### BUGGY CODE ###

from collections import deque
import copy

def main():
    h,w = map(int, input().split())
    a = [[j == "#" for j in input()] for _ in range(h)]
    que = deque([(i, j) for i in range(h) for j in range(w) if a[i][j]])
    dy = [1,-1,0,0]
    dx = [0,0,1,-1]
    count = 0
    while True:
        count += 1
        nque = deque()
        while que:
            y,x = que.popleft()
            for i in range(4):
                nh = y + dy[i]
                nw = x + dx[i]
                if (0<=nh<h) and (0<=nw<w):
                    if a[nh][nw] == False:
                        a[nh][nw] = True
                        nque.append((nh,nw))
           
        if nque:
            que = copy.copy(nque)
        else:
            break
    print(count-1)
if __name__ == '__main__':
    main()


### FIXED CODE ###

from collections import deque
import copy

def main():
    h, w = map(int, input().split())
    a = [[j == "#" for j in input()] for _ in range(h)]


    # スタート地点をqueueに追加
    que = deque([(i, j) for i in range(h) for j in range(w) if a[i][j]])

    count = 0
    while True:
        count += 1
        nque = deque()
        while que:
            y, x = que.popleft()
            if x > 0 and not a[y][x-1]:
                a[y][x-1] = True
                nque.append((y,x-1))
            if x < w-1 and not a[y][x+1]:
                a[y][x+1] = True
                nque.append((y,x+1))
            if y > 0 and not a[y-1][x]:
                a[y-1][x] = True
                nque.append((y-1,x))
            if y < h-1 and not a[y+1][x]:
                a[y+1][x] = True
                nque.append((y+1,x))

        if nque:
            que = copy.copy(nque)
        else:
            break

    print(count - 1)

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

N,W=map(int,input().split())
weight=[0]*N
values=[0]*N
for i in range(N):
  weight[i],values[i]=map(int,input().split())

dp=[[0 for i in range(W+1)] for j in range(N+1)]

for i in range(N):
  for w in range(W+1):
    if w>=weight[i]:
      dp[i+1][w]=max(dp[i][w],dp[i][w-weight[i]]+values[i])
    else:
      dp[i+1][w]=dp[i][w]
      
print(dp[N][W])


### FIXED CODE ###

def calc():
  N,W=map(int,input().split())
  dp=[-1]*(W+1)
  dp[0]=0
  for i in range(N):
    w,v=map(int,input().split())
    for j in range(W-w,-1,-1):
      if dp[j]!=-1:
        if dp[j+w]<dp[j]+v:
          dp[j+w]=dp[j]+v
  print(max(dp))
  
calc()
### BUGGY CODE ###

H, W, D = [int(_) for _ in input().split()]
A = [[int(_) for _ in input().split()] for i in range(H)]
Q, = [int(_) for _ in input().split()]
LR = [[int(_) for _ in input().split()] for i in range(Q)]

"""
H, W, D = 300, 300, 1
Q = 1
A = [[j + i * 300 for j in range(300)] for i in range(300)]
LR = [[0, 300*300-1], [0, 300*300-1], [0, 300*300-1]]
"""

pos = {}
for i, row in enumerate(A):
    for j, x in enumerate(row):
        pos[x] = (i, j)

def calc(x, y, cache={}):
    if (x, y) in cache:
        return cache[(x, y)]
    p1 = pos[x]
    p2 = pos[y]
    r = abs(p1[0] - p2[0]) + abs(p1[1] - p2[1])
    cache[(x, y)] = r
    return r

for l, r in LR:
    result = 0
    x = l
    while x < r:
        y = x + D
        result += calc(x, y)
        x += D
    print(result)


### FIXED CODE ###

H, W, D = [int(_) for _ in input().split()]
A = [[int(_) for _ in input().split()] for i in range(H)]
Q, = [int(_) for _ in input().split()]
LR = [[int(_) for _ in input().split()] for i in range(Q)]

"""
H, W, D = 300, 300, 1
Q = 1
A = [[j + i * 300 + 1 for j in range(300)] for i in range(300)]
LR = [[0, 300*300-1], [0, 300*300-1], [0, 300*300-1]]
"""

pos = {}
for i, row in enumerate(A):
    for j, x in enumerate(row):
        pos[x] = (i, j)

dt = [0] * (H * W + 1)
for x in range(1, D + 1):
    r = 0
    while 1:
        dt[x] = r
        y = x + D
        if y > H * W:
            break
        p1 = pos[x]
        p2 = pos[y]
        r += abs(p1[0] - p2[0]) + abs(p1[1] - p2[1])
        x = y

for l, r in LR:
    print(dt[r] - dt[l])
### BUGGY CODE ###

import math
K = int(input())
ans = 0
memo = {}


for i in range(1,K+1):
    for j in range(1,K+1):
        for k in range(1,K+1):
            s = {i,j,k}
            s = tuple(s)
            if s in memo.keys():
                ans += memo[s]
            else:
                tmp = math.gcd(j,k)
                tmp = math.gcd(tmp,i)
                ans += tmp
                memo[s] = tmp

print(ans)

### FIXED CODE ###

import math
from functools import reduce

def gcd(*numbers):
    return reduce(math.gcd, numbers)

K = int(input())
ans = 0
memo = {}

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 ###

from sys import stdin, setrecursionlimit
from collections import Counter, deque, defaultdict
import heapq
from math import floor, ceil
from bisect import bisect_left
from itertools import combinations
setrecursionlimit(100000)

INF = int(1e10)
MOD = int(1e9 + 7)

dh = [0, 0, 1, -1]
dw = [1, -1, 0, 0]

def main():
    from builtins import int, map
    H, W = map(int, input().split())
    Ch, Cw = map(int, input().split())
    Dh, Dw = map(int, input().split())
    Ch, Cw = Ch - 1, Cw - 1
    Dh, Dw = Dh - 1, Dw - 1
    S = [list(input()) for _ in range(H)]
    counter = 0
    for h in range(H):
        for w in range(W):
            if S[h][w] == '.':
                counter += 1
    # for row in S: print(*row)

    # DFSする (近隣への移動はコスト0，ワープ(5x5-grid)はコスト1)
    dist = defaultdict(lambda: float("inf"))
    dist[Ch, Cw] = 0
    queue = deque([(Ch, Cw, 0)])

    while queue:
        (h, w, d) = queue.popleft()

        if (h, w) == (Dh, Dw):
            break

        for i in range(4):
            dhi, dwi = dh[i], dw[i]
            nh, nw = h + dhi, w + dwi
            if 0 <= nh < H and 0 <= nw < W and S[nh][nw] != '#':
                if dist[nh, nw] == float("inf") or dist[nh, nw] > d:
                    dist[nh, nw] = dist[h, w]
                    queue.appendleft((nh, nw, d))
        
        # 5x5-grid
        for ddh in range(-2, 3):
            for ddw in range(-2, 3):
                nh, nw = h + ddh, w + ddw
                if 0 <= nh < H and 0 <= nw < W and S[nh][nw] != '#':
                    if dist[nh, nw] == float("inf"):
                        if dist[nh, nw] > dist[h, w] + 1:
                            dist[nh, nw] = dist[h, w] + 1
                            queue.append((nh, nw, d + 1))

    if dist[Dh, Dw] == float("inf"):
        print(-1)
    else:
        print(dist[Dh, Dw])

if __name__ == '__main__':
    main()


### FIXED CODE ###

from collections import deque
INF = int(1e10)

def main():
    from builtins import int, map
    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())
    S = [input() for _ in range(H)]

    # dist = defaultdict(lambda: float("inf"))
    dist = [[float("inf")] * W for _ in range(H)]
    queue = deque([(Ch, Cw, 0)])

    while queue:
        (h, w, d) = queue.popleft()

        if dist[h][w] == float("inf") or dist[h][w] > d:
            dist[h][w] = d
            
            # 5x5-grid
            for ddh in range(-2, 3):
                for ddw in range(-2, 3):
                    nh, nw = h + ddh, w + ddw
                    if 0 <= nh < H and 0 <= nw < W and S[nh][nw] == '.':
                        # cost-0 move
                        if abs(ddh) + abs(ddw) <= 1:
                            queue.appendleft((nh, nw, d))
                        # cost-1 move
                        else:
                            queue.append((nh, nw, d + 1))

    if dist[Dh][Dw] == float("inf"):
        print(-1)
    else:
        print(dist[Dh][Dw])

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

N = int(input())
S = []
for i in range(N):
    item = input()
    if item not in S:
        S.append(item)
print(len(S))

### FIXED CODE ###

N = int(input())
S = set()
count = 0
for i in range(N):
    S.add(input())
print(len(S))
### BUGGY CODE ###

def sort(a,b,c):
    l=[a,b,c]
    l.sort()
    return l

n=int(input())
s=input()
S=list(enumerate(s))
r=[n for n,v in S if v=='R']
g=[n for n,v in S if v=='G']
b=[n for n,v in S if v=='B']
sum=0
for x in g:
    for y in r:
        for z in b:
            i,j,k=sort(x,y,z)
            if k-j!=j-i:
                sum+=1
print(sum)

### FIXED CODE ###

def sort(a,b,c):
    l=[a,b,c]
    l.sort()
    return l

n=int(input())
s=input()
r=s.count('R')
g=s.count('G')
b=s.count('B')
sum=r*g*b
for i in range(n-2):
    for j in range(i+1,n-1):
        k=2*j-i
        if k<n and s[i]!=s[j] and s[i]!=s[k] and s[j]!=s[k]:
            sum-=1
print(sum)
### BUGGY CODE ###

# -*- coding: utf-8 -*-

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

ans = -float("inf")
for i in range(n, 2 * n + 1):
    fh = a[:i].copy()
    fh.sort(reverse=True)
    sh = a[i:].copy()
    sh.sort()
    score = sum(fh[:n]) - sum(sh[:n])
    ans = max(ans, score)

print(ans)


### FIXED CODE ###

# -*- coding: utf-8 -*-

import heapq

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

fh_sum = 0
fh = []
sh_sum = 0
sh = []
for i in range(n):
    heapq.heappush(fh, a[i])
    fh_sum += a[i]
    heapq.heappush(sh, -a[-(i+1)])
    sh_sum += a[-(i+1)]

fh_sums = [fh_sum]
sh_sums = [sh_sum]
for k in range(n, 2 * n):
    fh_sum += a[k]
    heapq.heappush(fh, a[k])
    fh_sum -= heapq.heappop(fh)
    fh_sums.append(fh_sum)
    sh_sum += a[-(k+1)]
    heapq.heappush(sh, -a[-(k+1)])
    sh_sum += heapq.heappop(sh)
    sh_sums.append(sh_sum)

sh_sums = sh_sums[::-1]

ans = -float("inf")
for fh_sum, sh_sum in zip(fh_sums, sh_sums):
    score = fh_sum - sh_sum
    ans = max(ans, score)

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

import math
n, m, k = map(int, input().split())

def comb(p, q):
    return math.factorial(p) // (math.factorial(q) * math.factorial(p-q))

ans = 0

for i in range(k+1):
    row = comb(n-1, i)
    column = m * (m-1)**(n-i-1)
    ans += row * column
    
print(ans% 998244353)

### FIXED CODE ###

import math
n, m, k = map(int, input().split())

p = 998244353

def comb(n, r, p):
    if (r < 0) or (n < r):
        return 0
    r = min(r, n-r)
    return fact[n] * factinv[r] * factinv[n-r] % p

fact = [1, 1]
factinv = [1, 1]
inv = [0, 1]

for i in range(2, n+1):
    fact.append(fact[-1]*i%p)
    inv.append((-inv[p % i] * (p // i)) % p)
    factinv.append((factinv[-1]*inv[i])%p)
ans = 0

for i in range(k+1):
    row = comb(n-1, i, p)
    column = m * pow(m-1, n-i-1, p)
    ans += row * column
    
print(ans % p)
### BUGGY CODE ###

import numpy as np

n =	int(input())
nums = [int(input()) for i in range(n)]

num_max = max(nums)

for idx, el in enumerate(nums):
	del nums[idx]
	if num_max == el:
		print(max(nums))
	else:
		print(num_max)
	nums.insert(idx, el)



### FIXED CODE ###

import numpy as np

n =	int(input())
nums = [int(input()) for i in range(n)]

num_max = np.max(nums)
next_max = sorted(nums)[-2]


for idx, el in enumerate(nums):
	if num_max == el:
		print(next_max)		
	else:
		print(num_max)
### BUGGY CODE ###

import sys
from itertools import accumulate

input = sys.stdin.readline


def main():
    N, M, Q = map(int, input().split())
    LR = [None] * M
    for i in range(M):
        LR[i] = tuple(map(int, input().split()))
    pq = [None] * Q
    for i in range(Q):
        pq[i] = tuple(map(int, input().split()))

    S = [[0] * (N + 1) for _ in range(N + 1)]
    for L, R in LR:
        S[L][R] += 1
    for i in range(N + 1):
        S[i] = list(accumulate(S[i]))

    ans = [0] * Q
    for i, (p, q) in enumerate(pq):
        for j in range(p, q + 1):
            ans[i] += S[j][q] - S[j][p - 1]

    print("\n".join(map(str, ans)))


if __name__ == "__main__":
    main()


### FIXED CODE ###

import sys

import numba as nb
import numpy as np

input = sys.stdin.readline


@nb.njit("i8[:](i8,i8,i8,i8[:,:],i8[:,:])", cache=True)
def solve(N, M, Q, LR, pq):
    S = np.zeros(shape=(N + 1, N + 1), dtype=np.int64)
    for i in range(M):
        L, R = LR[i]
        S[L][R] += 1
    for i in range(N + 1):
        S[i] = np.cumsum(S[i])

    ans = np.zeros(shape=Q, dtype=np.int64)
    for i in range(Q):
        p, q = pq[i]
        for j in range(p, q + 1):
            ans[i] += S[j][q] - S[j][p - 1]

    return ans


def main():
    N, M, Q = map(int, input().split())
    LR = np.zeros(shape=(M, 2), dtype=np.int64)
    for i in range(M):
        LR[i] = input().split()
    pq = np.zeros(shape=(Q, 2), dtype=np.int64)
    for i in range(Q):
        pq[i] = input().split()

    ans = solve(N, M, Q, LR, pq)

    print("\n".join(map(str, ans)))


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

def main():
    K,A,B = map(int,input().split())
    if A +2 >= B:
        print(K+1)
    else:
        
        dp = [1,2]+[0 for i in range(K-1)]
        for i in range(2,K+1):
            if dp[i-2] == -1:
                if dp[i-1] >= A:
                    dp[i] =-1
                else:
                    dp[i] = dp[i-1]+1
            else:
                if dp[i-2] >= A:
                    dp[i] = dp[i-2]-A+B
                elif dp[i-1] >= A:
                    dp[i] = -1
                else:
                    dp[i] = dp[i-1]+1

        if dp[-1] == -1:
            print(dp[-2]+1)
        else:
            print(dp[-1])
main()


### FIXED CODE ###

def main():
    K,A,B = map(int,input().split())
    sum = K+1
    
    if A + 2>= B or K <= A:
        print(K+1)
    else:
        if (K-A+1)%2 == 0:
            sum = (((K-A+1)//2)-1)*(B-A)+B
        else:
            sum = (((K-A+1)//2)-1)*(B-A)+1+B
        print(sum)
main()
### BUGGY CODE ###

# https://atcoder.jp/contests/abc107/tasks/arc101_a
# C - Candles

n, k = list(map(int, input().split()))
x_list = list(map(int, input().split()))
x_list = sorted(x_list)
min_l = float('inf')
# 0の場所は

for i, x in enumerate(x_list):
    l = 0
    work_list = x_list[i:i+k]
    minus_list = [x for x in work_list if x < 0]
    plus_list = [x for x in work_list if x >= 0]

    minus_l = -minus_list[0] if minus_list else 0
    plus_l = plus_list[-1] if plus_list else 0

    if plus_l > minus_l:
        l = minus_l * 2 + plus_l
    else:
        l = plus_l * 2 +  minus_l

    if l < min_l:
        min_l = l

    if i + k > n - 1:
        break

print(min_l)

### FIXED CODE ###

# https://atcoder.jp/contests/abc107/tasks/arc101_a
# C - Candles

n, k = list(map(int, input().split()))
x_list = list(map(int, input().split()))
x_list = sorted(x_list)
min_l = float('inf')

minus_list = [x for x in x_list if x < 0]
plus_index = len(minus_list)

for i, x in enumerate(x_list):
    left, right = x_list[i], x_list[i+k-1]
    # 最左端に行ってから、最右端に行く
    a = abs(left) + abs(left-right)
    # 最右端に行ってから、最左端に行く
    b = abs(right) + abs(right - left)
    l = min(a, b)

    if l < min_l:
        min_l = l

    if i + k > n - 1:
        break

print(min_l)
### BUGGY CODE ###

def main():
    n,k=map(int,input().split())
    X=list(map(int,input().split()))
    cnt=0
    Xp,Xz,Xm=0,False,0
    for x in X:
        if x<0:
            cnt+=1
        elif x==0:
            Xm=X[:cnt]
            Xz=True
            Xp=X[cnt+1:]
        else:
            Xm=X[:cnt]
            Xp=X[cnt:]
    if Xp==0:
      Xm=X
      Xp=[]
    lp,lm=len(Xp),len(Xm)

    if Xz:
        k-=1
    if k==0:
      print(0)
      exit()
      
    ans=10**9
    if k<=lp:
        ans=min(ans,Xp[k-1])
    if k<=lm:
        ans=min(ans,-Xm[-k])

    for i in range(lp):
        j=k-i-1
        if 0<j<=lm:
            ans=min(ans,Xp[i]*2-Xm[-j])
        else:
            continue
        
    for i in range(lm,0,-1):
        j=k-i-1
        if 0<=j<lp:
            ans=min(ans,Xm[-i]*(-2)+Xp[j])
        else:
            continue
    print(ans)
   
if __name__=='__main__':
    main()

### FIXED CODE ###

def main():
    import numpy as np
    n,k=map(int,input().split())
    X=list(map(int,input().split()))
    X=np.array(X)
    Xp,Xz,Xm=X[X>0],X[X==0],X[X<0]
    lp,lm=len(Xp),len(Xm)

    if 0 in Xz:
        k-=1
    if k==0:
      print(0)
      exit()
      
    ans=10**9
    if k<=lp:
        ans=min(ans,Xp[k-1])
    if k<=lm:
        ans=min(ans,-Xm[-k])

    for i in range(lp):
        j=k-i-1
        if 0<j<=lm:
            ans=min(ans,Xp[i]*2-Xm[-j])
        else:
            continue
        
    for i in range(lm,0,-1):
        j=k-i-1
        if 0<=j<lp:
            ans=min(ans,Xm[-i]*(-2)+Xp[j])
        else:
            continue
    print(ans)
   
if __name__=='__main__':
    main()
### BUGGY CODE ###

import sys
input = sys.stdin.readline
from collections import defaultdict,deque
n,q=map(int, input().split())
c=list(map(int, input().split()))
c=[i-1 for i in c]
lr=[]
for i in range(q):
    l,r=map(int, input().split())
    lr.append((l-1,r-1))
lrsort=sorted(lr, key=lambda x:x[0])
lrsort=sorted(lr, key=lambda x:x[1])
lrsort=deque(lrsort)
#print(lrsort)
goodpos=[-1]*n
isgood=[0]*n
d=defaultdict(int)
s=0
while lrsort:
    l,r=lrsort.popleft()
    for i in range(s,r+1):
        if goodpos[c[i]]!=-1:
            isgood[goodpos[c[i]]]=0
        goodpos[c[i]]=i
        isgood[i]=1
    s=r+1
    d[(l,r)]=sum(isgood[l:])

for l,r in lr:
    print(d[(l,r)])

### FIXED CODE ###

import sys
input = sys.stdin.readline
# Binary Indexed Tree (Fenwick Tree)
class BIT:
    def __init__(self, n):
        self.n = n
        self.data = [0]*(n+1)
        self.el = [0]*(n+1)
    def sum(self, i):
        s = 0
        while i > 0:
            s += self.data[i]
            i -= i & -i
        return s
    def add(self, i, x):
        # assert i > 0
        self.el[i] += x
        while i <= self.n:
            self.data[i] += x
            i += i & -i
    def get(self, i, j=None):
        if j is None:
            return self.el[i]
        return self.sum(j) - self.sum(i)

n,q=map(int,input().split())
c=list(map(int,input().split()))
ques=[]
from collections import defaultdict
ans=defaultdict(int)
for _ in range(q):
    l,r=map(int,input().split())
    ques.append((l,r))

sortques=sorted(ques, key=lambda x:x[1])

good=BIT(n+1)
goodind=[-1]*n
last=0
for x in range(q):
    l,r=sortques[x]
    if last!=r:
        for i in range(last, r):
            if goodind[c[i]-1]==-1:
                goodind[c[i]-1]=i
                good.add(i+1, 1)
            else:
                j=goodind[c[i]-1]
                good.add(j+1, -1)
                goodind[c[i]-1]=i
                good.add(i+1, 1)
    ans[(l,r)]=good.get(l-1,r)
    last=r

for i in range(q):
    print(ans[ques[i]])
### BUGGY CODE ###

R, C, K = map(int, input().split())

V = [[0]*(C+1) for _ in range(R+1)]
for _ in range(K):
    r, c, v = map(int, input().split())
    V[r][c] = v

max_p = [0]*(C+1)
for i in range(R+1):
    now0 = [0]*(C+1)
    now1 = [0]*(C+1)
    now2 = [0]*(C+1)
    now3 = [0]*(C+1)
    for j in range(C+1):
        v = V[i][j]
        la = lb = 0
        if j > 0:
            la = now0[j-1]
            lb = now1[j-1]
            now2[j] = max(now2[j], now2[j-1], lb + v)
            now3[j] = max(now3[j], now3[j-1], now2[j-1] + v)
        if i > 0:
            now0[j] = max(now0[j], max_p[j], la)
            now1[j] = max(now1[j], max_p[j] + v, la + v, lb)
        max_p[j] = max(now0[j], now1[j], now2[j], now3[j])

print(max(now0[C], now1[C], now2[C], now3[C]))


### FIXED CODE ###

R, C, K = map(int, input().split())

V = [[0]*(C+1) for _ in range(R+1)]
for _ in range(K):
    r, c, v = map(int, input().split())
    V[r][c] = v

pre = [[0]*(3+1) for _ in range(C+1)]
for i in range(R+1):
    now = [[0]*(3+1) for _ in range(C+1)]
    for j in range(C+1):
        for k in range(3+1):
            if i-1 >= 0:
                now[j][0] = max(now[j][0], pre[j][k])
                now[j][1] = max(now[j][1], pre[j][k] + V[i][j])

            if j-1 >= 0:
                now[j][k] = max(now[j][k], now[j-1][k])
                if k-1 >= 0:
                    now[j][k] = max(now[j][k], now[j-1][k-1] + V[i][j])
    pre = now

print(max(now[C]))
### BUGGY CODE ###

s = raw_input()
k = int(raw_input())
l = len(s)
ls = []
for a in range(l):
    for b in range(a+1,l+1):
        if ls.count(s[a:b]) == 0:
            ls.append(s[a:b])
ls.sort()
print ls[k-1]

### FIXED CODE ###

s = raw_input()
k = int(raw_input())
l = len(s)
ls = []
for a in range(l):
    for b in range(a+1,min(a+k+1,l+1)):
        if ls.count(s[a:b]) == 0:
            ls.append(s[a:b])
ls.sort()
print ls[k-1]
### BUGGY CODE ###

#!/usr/bin/python

from pprint import pprint
import sys
 
n = int(sys.stdin.readline().strip())
a = map(int, sys.stdin.readline().strip().split(" "))

zero_count = [0] * 60
for a_i in a:
    binary = format(a_i, '060b')
    for i, bit in enumerate(binary):
        zero_count[i] += int(bit)

# pprint(zero_count)

ans = 0
for i, count in enumerate(zero_count[::-1]):
    # print(i, count)
    ans += (2 ** i) * (count * (n - count))
    ans %= 10**9 + 7 
    # print(ans)

print(ans)

### FIXED CODE ###

import sys
from pprint import pprint

mod = 10**9 + 7

def pow_r(x, n):
    """
    O(log n)
    """
    if n == 0:  # exit case
        return 1
    if n % 2 == 0:
        return pow_r(x ** 2, n // 2) % mod
    else:
        return (x * pow_r(x ** 2, (n - 1) // 2)) % mod


def solve(n, a):

    zero_count = [0] * 60
    for a_i in a:
        # binary = format(a_i, '060b')
        # for j, b_j in enumerate(binary):
        #    zero_count[j] += int(b_j)
        for j in range(61):
            if a_i >> j & 1:
                zero_count[j] += 1

    ans = 0
    # for i, count in enumerate(zero_count[::-1]):
    for i, count in enumerate(zero_count):
        # ans += (2**i) * (count * (n - count)) 
        ans += pow_r(2, i) * (count % mod) * ((n - count) % mod) 
        ans %= mod
    print(ans)

if __name__ == '__main__':
    n = int(sys.stdin.readline().strip())
    a = map(int, sys.stdin.readline().strip().split(" "))
    
    solve(n, a)
### BUGGY CODE ###

n, c = map(int, input().split())
T = 10**5+1
l = [[0]*c for _ in range(T)]

for _ in range(n):
    s, t, c_ = map(int, input().split())
    c_ -= 1
    l[s-1][c_] += 1
    l[t][c_]   -= 1

for i in range(1, T):
    for c_ in range(c):
        l[i][c_] += l[i-1][c_]
        l[i-1][c_] = min(1, l[i-1][c_])

ans = 0
for i in range(T):
    ans = max(ans, sum(l[i]))

print(ans)


### FIXED CODE ###

n, c = map(int, input().split())
T = 10**5+1
l = [[0]*c for _ in range(T)]

for _ in range(n):
    s, t, c_ = map(int, input().split())
    c_ -= 1
    for i in range(s-1, t):
        l[i][c_] = 1

ans = 0
for i in range(T):
    ans = max(ans, sum(l[i]))

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

n=int(input())
s=input()
cnt=float('inf')
wnum=0
bnum=0
for i in range(n+1):
  s1=s[:i]
  s2=s[i:]
#  print(s1,s2)
  wnum=s1.count('#')
  bnum=s2.count('.')
  cnt=min(cnt,wnum+bnum)

if s.count('#')==n or s.count('.')==n:
  cnt=0
  
print(cnt)
  

### FIXED CODE ###

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

wlist=[0 for i in range(n)]
blist=[0 for i in range(n)]

wnum=0
bnum=0

for i in range(n):
  if s[i]=='.':
    wnum+=1
  else:
    bnum+=1
  wlist[i]=wnum
  blist[i]=bnum
#print(wlist,blist)

ans=float('inf')  
for i in range(n):
  ans=min(ans,wlist[-1]-wlist[i]+blist[i])
  
ans=min(ans,wlist[-1],blist[-1])

print(ans)