qyliang/CodeNanoFix huggingface dataset:
Buggy code:
s=input()
K=int(input())

ans=[]
ans.append(s)


for i in range(len(s)-1):
 for j in range(i+1):
  cut_s=s[j:j+len(s)-i-1]
  ans.append(cut_s)
  ans=sorted(set(ans))
  if len(ans)>K:
   ans.pop()
  print(ans)
    


answer=ans[K-1]
print(answer)

Fixed code:
s=input()
K=int(input())
 
ans=[]
ans.append(s)
 
 
for i in range(len(s)):
 for j in range(len(s)-i):
  cut_s=s[i:i+j+1]
  ans.append(cut_s)
  ans=sorted(set(ans))
  if len(ans)>K:
   if cut_s==ans[K]:
     ans.pop()
     break;
   ans.pop()
 
answer=ans[K-1]
print(answer)
Buggy code:
S = input()
n = len(S)
k = int(input())
cnt = 0
itl = sorted(list(set(S)))
ans = set([])
for w in itl:
    for i, s in enumerate(S):
        if s != w:
            continue
        else:
            for j in range(i+1, n+1):
                ans.add(S[i:j])
                cnt += 1
                if cnt == k:
                    break

    ans.clear()

ans = list(ans)
ans.sort()
index = k - 1 - (cnt - len(ans))
print(ans[index])


Fixed code:
S = input()
n = len(S)
k = int(input())
cnt = 0
itl = sorted(list(set(S)))
ans = set([])
for w in itl:
    for i, s in enumerate(S):
        if s != w:
            continue
        else:
            for j in range(i+1, i+k+1):
                ans.add(S[i:j])
    cnt += len(ans)
    if cnt >= k:
        break
    else:
        ans.clear()

ans = list(ans)
ans.sort()
index = k - 1 - (cnt - len(ans))
print(ans[index])
Buggy code:
s=input()
K=int(input())

dic={}
for i in range(len(s)):
    dic[s[i:]]=1
arr=sorted(dic)
dic={}
ans=''
for x in arr:
    for i in range(0,len(x)):
        tmp = x[:i+1]
        if dic.get(tmp,0)==0:
            K-=1
            dic[tmp]=1
        else:
            continue
        if K==0:
            ans=x[:i+1]
            break
    if K<0:
        break

Fixed code:
s=input()
K=int(input())

dic={}
for i in range(len(s)):
    dic[s[i:]]=1
arr=sorted(dic)
dic={}

for x in arr:
    for i in range(0,len(x)):
        tmp = x[:i+1]
        if dic.get(tmp,0)==0:
            K-=1
            dic[tmp]=1
        else:
            continue
        if K==0:
            print(x[:i+1])
            break
    if K<0:
        break
Buggy code:
#!usr/bin/env python3
s = input()
K = int(input())

l = {s}
for n in range(1, K+1):
    for i in range(0, len(s)-n+1):
        l.add(s[i:i+n])
    print(l)
l = list(l)

l.sort()

print(l[K-1])

Fixed code:
#!usr/bin/env python3
s = input()
K = int(input())

l = {s}
for n in range(1, K+1):
    for i in range(0, len(s)-n+1):
        l.add(s[i:i+n])
l = list(l)

l.sort()

print(l[K-1])
Buggy code:
s = input()
K = int(input())
substrings = {s[i:j]:0 for i in range(min(K, len(s))) for j in range(i+1, min(K+1, len(s)+1))}
print(sorted(substrings)[K-1])


Fixed code:
s = input()
K = int(input())
substrings = {s[i:j]:0 for i in range(len(s)) for j in range(i+1, min(i+1+K, len(s)+1))}
print(sorted(substrings)[K-1])
Buggy code:
s = input()
k = int(input())
arr = set()
arr.add(s)
for i in range(len(s)-1):
    for j in range(1, len(s)):
        arr.add(s[j:j+i+1])
arr = list(arr)
arr.sort()
print(arr[k-1])


Fixed code:
s = input()
k = int(input())
arr = set()
for i in range(min(k, len(s))):
    for j in range(len(s)):
        arr.add(s[j:j+i+1])
arr = list(arr)
arr.sort()
print(arr[k-1])
Buggy code:
s = input()
k = int(input())
arr = set()
arr.add(s)
for i in range(len(s)-1):
    for j in range(0, len(s)):
        arr.add(s[j:j+i+1])
    if len(arr) >= k: break
arr = list(arr)
arr.sort()
print(arr)
print(arr[k-1])


Fixed code:
s = input()
k = int(input())
arr = set()
arr.add(s)
for i in range(len(s)-1):
    if i > 5:
        break
    for j in range(0, len(s)):
        arr.add(s[j:j+i+1])

arr = list(arr)
arr.sort()
print(arr[k-1])
Buggy code:
s=input()
K=int(input())
p=set()
for i in range(len(s)):
  for j in range(1,6):
    if i+j<=len(s):
      p.add(s[i:j+1])
p=sorted(p)
print(p[K-1])

Fixed code:
s=input()
s=s+'0'
K=int(input())
p=set()
for i in range(len(s)):
  for j in range(1,6):
    if i+j<=len(s)-1:
      p.add(s[i:j+i])
p=sorted(p)
print(p[K-1])
Buggy code:
s = input()
K = int(input())
lst = []
if len(s) == 1:
    print(s)
    exit()
for end in range(1, min(K, len(s))):
    start = 0
    while end < len(s)+1:
        if s[start:end] not in lst:
            lst.append(s[start:end])
        start += 1
        end += 1
lst.sort()
print(lst[-K])

Fixed code:
s = input()
K = int(input())
lst = []
for end in range(1, min(K+1, len(s)+1)):
    start = 0
    while end < len(s)+1:
        if s[start:end] not in lst:
            lst.append(s[start:end])
        start += 1
        end += 1
lst.sort()
print(lst[K-1])
Buggy code:
def solve(string):
    s, k = string.split()
    k = int(k)
    chars = sorted(set(s))
    exists = []

    def dfs(base):
        exists.append(base)
        print(exists)
        if len(exists) >= k:
            return
        for c in chars:
            if base + c in s:
                dfs(base + c)

    for c in chars:
        dfs(c)

    return exists[k - 1]


if __name__ == '__main__':
    print(solve('\n'.join([input(), input()])))


Fixed code:
def solve(string):
    s, k = string.split()
    k = int(k)
    chars = sorted(set(s))
    exists = []

    def dfs(base):
        exists.append(base)
        if len(exists) >= k:
            return
        for c in chars:
            if base + c in s:
                dfs(base + c)

    for c in chars[:3]:
        dfs(c)

    return exists[k - 1]


if __name__ == '__main__':
    print(solve('\n'.join([input(), input()])))
Buggy code:
from collections import Counter


def solve(string):
    s, k = string.split()
    """
    g = []
    for i in range(len(s)):
        for j in range(i + 1, len(s) + 1):
            g.append(s[i:j])
    g = sorted(set(g))
    return g[int(k)-1]
    """
    k = int(k)
    count = Counter(s)
    chars = sorted(set(s))
    for t in range(min(3, len(chars))):
        tmp = []
        i = s.index(chars[t])
        tmp.append(s[i:i + 5])
        if count[chars[t]] > 1:
            for _ in range(count[chars[t]] - 1):
                i = s.index(chars[t], i + 1)
                tmp.append(s[i:i + 5])
        g = []
        for p in tmp:
            for j in range(1, len(p) + 1):
                g.append(p[:j])
        g = sorted(set(g))
        print(g)
        if len(g) < k:
            k -= len(g)
            continue
        return g[k - 1]


if __name__ == '__main__':
    print(solve('\n'.join([input(), input()])))


Fixed code:
from collections import Counter


def solve(string):
    s, k = string.split()
    """
    g = []
    for i in range(len(s)):
        for j in range(i + 1, len(s) + 1):
            g.append(s[i:j])
    g = sorted(set(g))
    return g[int(k)-1]
    """
    k = int(k)
    count = Counter(s)
    chars = sorted(set(s))
    for t in range(min(3, len(chars))):
        tmp = []
        i = s.index(chars[t])
        tmp.append(s[i:i + 5])
        if count[chars[t]] > 1:
            for _ in range(count[chars[t]] - 1):
                i = s.index(chars[t], i + 1)
                tmp.append(s[i:i + 5])
        g = []
        for p in tmp:
            for j in range(1, len(p) + 1):
                g.append(p[:j])
        g = sorted(set(g))
        if len(g) < k:
            k -= len(g)
            continue
        return g[k - 1]


if __name__ == '__main__':
    print(solve('\n'.join([input(), input()])))
Buggy code:
s = input()
K = int(input())

sub = set()
for i in range(1, len(s) + 1):
    for k in range(int(len(s) / i) + 1):
        sub.add(s[k:i + k])

print(sorted([i for i in sub])[K])


Fixed code:
s = input()
K = int(input())

sub = set()
for i in range(1, K + 1):
    for k in range(len(s) - i + 1):
        sub.add(s[k:i + k])

print(sorted([i for i in sub])[K - 1])
Buggy code:
s = input()
k = int(input())

dct = []
for i in range(len(s)):
    for j in range(k+1):
        word = s[i:i+j]
        if word not in dct:
            dct.append(word)
dct.sort()

for d in dct:
    print(d)

Fixed code:
s = input()
k = int(input())

dct = []
for i in range(len(s)):
    for j in range(k+1):
        word = s[i:i+j]
        if word not in dct:
            dct.append(word)
dct.sort()

print(dct[k])
Buggy code:
s = input()
k = int(input())

n = len(s)
strs = set([])

for i in range(n):
    for j in range(i+1, n+1):
        strs.add(s[i:j])
strs = list(strs)
#strs.sort()
print(strs[k-1])


Fixed code:
s = input()
k = int(input())

n = len(s)
strs = set([])

for i in range(n):
    for j in range(i+1, min(i+k+1,n+1)):
        strs.add(s[i:j])
strs = list(strs)
strs.sort()
print(strs[k-1])
Buggy code:
s=input()
n=len(s)
k=int(input())
lst=list(s)
lst.sort()
ans=[]
for i in range(min(k,n)):
    a=lst[i]
    for j in range(n):
        if s[j]==a:
            for l in range(min(5,n-j)):
                ans.append(s[j:j+l+1])
            if n-j>5:
                break
    else:
        continue
    break
ans.sort()
t=1
while t<len(ans):
    if ans[t]==ans[t-1]:
        ans.pop(t)
    else:
        t+=1
print(ans[k-1])

Fixed code:
s=input()
n=len(s)
k=int(input())
lst=list(s)
lst.sort()
ans=[]
for i in range(min(k,n)):
    a=lst[i]
    count=0
    for j in range(n):
        if s[j]==a:
            count+=1
            for l in range(min(5,n-j)):
                ans.append(s[j:j+l+1])
    if count>=5:
        break
ans.sort()
t=1
while t<len(ans):
    if ans[t]==ans[t-1]:
        ans.pop(t)
    else:
        t+=1
print(ans[k-1])
Buggy code:
s = input()
k = int(input())

substrings = set()
n = len(s)
for i in range(n):
  for j in range(i+1,k+1):    
    substrings.add(s[i:j])
    
print(sorted(substrings)[k-1])

Fixed code:
s = input()
k = int(input())

substrings = set()
n = len(s)
for i in range(n):
  for j in range(1,k+1):    
    substrings.add(s[i:i+j])
    
print(sorted(substrings)[k-1])
Buggy code:
s = input()
K = int(input())
w = []
for i in range(len(s)-K+1):
  for j in range(i,i+K):
    temp = s[i:j+1]
    if temp not in w:
      w.append(temp)
      
w.sort()
print(w[K-1])

Fixed code:
s = input()
K = int(input())
w = []
for i in range(len(s)):
  for j in range(i,i+K):
    temp = s[i:j+1]
    if temp not in w:
      w.append(temp)
      
w.sort()
print(w[K-1])
Buggy code:
s = input()
k = int(input())

s_list = []
for i in range(0, len(s)):
    for j in range(1, len(s)-i+1):
        if len(s_list) < k:
            s_list.append(s[i:i+j])
            s_list.sort()
        elif s_list[k-1] > s[i:i+j]:
            s_list.append(s[i:i+j])
            s_list = list(set(s_list))
            s_list.sort()
            s_list = s_list[:k]

print(s_list)
dict_list = list(set(s_list))
dict_list.sort()

print(dict_list[k-1])

Fixed code:
s = input()
k = int(input())

s_list = []
for i in range(0, len(s)):
    for j in range(1, 1+k):
        if len(s_list) < k:
            s_list.append(s[i:i+j])
            s_list = list(set(s_list))
            s_list.sort()
        elif s_list[k-1] > s[i:i+j]:
            s_list.append(s[i:i+j])
            s_list = list(set(s_list))
            s_list.sort()
            s_list = s_list[:k]
    else:
        continue

dict_list = list(set(s_list))
dict_list.sort()

print(dict_list[k-1])
Buggy code:
def main2():
    S=list(input())
    K=int(input())
    N=len(S)

    P=sorted(S)
    l=[]
    k=0
    while len(l)<=5:
        for n in range(N):
            if S[n]==P[k]:
                for i in range(1,6):
                    if n+i<N-1:
                        tmp="".join(S[n:n+i])
                        if tmp not in l:
                            l.append(tmp)
        k+=1
    l.sort()
    print(l[K-1])

if __name__=="__main__":
    main2()

Fixed code:
def main2():
    S=list(input())
    K=int(input())
    N=len(S)

    P=sorted(S)
    l=[]
    a=[]
    k=0
    while len(l)<=5 and k<N:
        if P[k] not in a:
            a.append(P[k])
            for n in range(N):
                if S[n]==P[k]:
                    for i in range(1,6):
                        if n+i<=N:
                            tmp="".join(S[n:n+i])
                            if tmp not in l:
                                l.append(tmp)
        k+=1
    l.sort()
    print(l[K-1])

if __name__=="__main__":
    main2()
Buggy code:
s = input()
K = int(input())

s_sub = list()
s_len = len(s)
for i in range(s_len):
    s_sub.append(s[i:])
    
s_sub.sort()
s_sub.append('')

pre_sum = 0
sum = len(s_sub[0])
for j in range(1,s_len+1):
    
    current = s_sub[j]
    before = s_sub[j-1]

    if sum >= K:
        print(before[:K-pre_sum+z])
        break

    z = 0
    for k in range(min(len(current),len(before))):
        if current[k] == before[k]:
            z+=1
        else:
            break  
    pre_sum =  sum 
    sum += len(current) - z

Fixed code:
s = input()
K = int(input())

s_sub = list()
s_len = len(s)
for i in range(s_len):
    s_sub.append(s[i:])
    
s_sub.sort()
s_sub.append('')

pre_sum = 0
sum = len(s_sub[0])
z=0
for j in range(1,s_len+1):
    
    current = s_sub[j]
    before = s_sub[j-1]

    
    if sum >= K:
        print(before[:K-pre_sum+z])
        break

    z = 0
    for k in range(min(len(current),len(before))):
        if current[k] == before[k]:
            z+=1
        else:
            break  
    pre_sum =  sum 
    sum += len(current) - z
Buggy code:
S = input()
K = int(input())
L=set()
for i in range(len(K)):
    for j in range(len(S)-i):
        L.add((S[j:j+i+1]))
L = sorted(list(L))
print(L[K-1])

Fixed code:
S = input()
K = int(input())
L=set()
for i in range(K):
    for j in range(len(S)-i):
        L.add((S[j:j+i+1]))
L = sorted(list(L))
print(L[K-1])
Buggy code:
s=input()
a=int(input())
r=[]
for i in range(len(s)):
  for j in range(i+1,min(k+i,len(s))+1):
    r.append(s[i:j])
r=list(set(r))
r.sort()
print(r[a-1])

Fixed code:
s=input()
a=int(input())
r=[]
for i in range(len(s)):
  for j in range(i+1,min(a+i,len(s))+1):
    r.append(s[i:j])
r=list(set(r))
r.sort()
print(r[a-1])
Buggy code:
s = list(input())
k = int(input())
sub = []
for i in range(1, min(len(s) + 1, k)):
    for j in range(1, len(s) + 2 - i):
        if not([s[s_i - 1] for s_i in range(j, j + i)] in sub):
            sub.append([s[s_i - 1] for s_i in range(j, j + i)])
sub.sort()
print(''.join(sub[k-1]))


Fixed code:
s = list(input())
k = int(input())
sub = []
for i in range(1, min(len(s) + 1, k + 1)):
    for j in range(1, len(s) + 2 - i):
        if not([s[s_i - 1] for s_i in range(j, j + i)] in sub):
            sub.append([s[s_i - 1] for s_i in range(j, j + i)])
sub.sort()
print(''.join(sub[k-1]))
Buggy code:
#encoding utf-8

import copy
import numpy as np
import random


s = list(str(input()))
k = int(input())

substrings = []
for length in range(1,len(s)+1):
    for i in range(len(s)-length+1):
        word = "".join(s[i:i+length])
        print(word)

        if word in substrings:
            pass
        else:
            substrings.append(str(word))

substrings.sort()
# print(substrings)
print(substrings[k-1])

Fixed code:
#encoding utf-8

import copy
import numpy as np
import random


s = list(str(input()))
k = int(input())

substrings = []
for length in range(1,len(s)+1):
    if length > 5:
        break
    for i in range(len(s)-length+1):
        word = "".join(s[i:i+length])
        # print(word)
        if word in substrings:
            pass
        else:
            substrings.append(str(word))

substrings.sort()
# print(substrings)
print(substrings[k-1])
Buggy code:
s = input()
k = int(input())

smin = list(set(list(s)))
print(smin)
smin = sorted(smin)[0:5]
print(smin)

def search(st):
    ans = []
    cnt = 0
    for a in st:
        if len(set(ans)) >= 5:
            return ans
        for i in range(len(s)):
            if s[i] is a:
                for j in range(6):
                    ans.append(s[i:min(i+j,len(s))])

    
    return ans
    
b = list(set(search(smin)))

if b[0] == '':
    del b[0]

print(b[k-1])

Fixed code:
s = input()
k = int(input())

smin = list(set(list(s)))
smin = sorted(smin)[0:5]


def search(st):
    ans = []
    cnt = 0
    for a in st:
        if len(set(ans)) >= 5:
            return ans
        for i in range(len(s)):
            if s[i] is a:
                for j in range(1,6):
                    ans.append(s[i:min(i+j,len(s))])

    
    return ans
    
b = list(set(search(smin)))
b = sorted(b)
if b[0] == '':
    del b[0]

print(b[k-1])
Buggy code:
s = input()
K = int(input())
l = []
for i in range(5):
    for j in range(len(s)):
        if j + i + 1 >=  len(s):
            break
        l.append(s[j:j + i + 1])
l = sorted(set(l))
print(l[K-1])

Fixed code:
s = input()
K = int(input())
l = []
for i in range(5):
    for j in range(len(s)):
        if j + i >=  len(s):
            break
        l.append(s[j:j + i + 1])
l = sorted(set(l))
print(l[K-1])
Buggy code:
s = input()
k = int(input())

array = []
for i in range(0, k):
    for j in range(0, len(s)-i):
        array.append(s[j:j+i+1])
print(sorted(set(array))[4])

Fixed code:
s = input()
k = int(input())

array = []
for i in range(0, k):
    for j in range(0, len(s)-i):
        array.append(s[j:j+i+1])

print(sorted(set(array))[k-1])
Buggy code:
s = input()
n = input()
ans = set([])
test = list(s)

for i in range(len(test)):
    s = test[i]
    ans.add(s)
    for j in range(i+1, len(test)):
        s = s + test[j]
        ans.add(s)
    
ans = list(ans)

ans.sort()
print(ans)
print(ans[int(n)-1])

Fixed code:
s = input()
n = input()
ans = set([])
test = list(s)

for i in range(len(test)):
    s = test[i]
    ans.add(s)
    for j in range(i+1, min(i+5, len(test))):
        s = s + test[j]
        ans.add(s)
    
ans = list(ans)

ans.sort()
print(ans[int(n)-1])
Buggy code:
s=input()
K=int(input())

N=len(s)
S=set()
for i in range(N):
    for j in range(i+1,min(i+6,N+1)):
        S.add(s[i:j])
l=sorted(list(S))
print(l)
print(l[K-1])

Fixed code:
s=input()
K=int(input())

N=len(s)
S=set()
for i in range(N):
    for j in range(i+1,min(i+6,N+1)):
        S.add(s[i:j])
l=sorted(list(S))
print(l[K-1])
Buggy code:
import collections

s = input()
k = int(input())
b = collections.Counter(s)
c = sorted(b.items())
con = []
n = 0
while True:
    con.append(c[n][0])
    if len(con) == k:
        break
    for i in range(len(c)):
        check = c[n][0] + c[i][0]
        if check in s:
            con.append(check)
            if len(con) >= k:
                break
            for i_2 in range(len(c)):
                check_2 = check + c[i_2][0]
                if check_2 in s:
                    con.append(check_2)
                    if len(con) >= k:
                        break
                    for i_3 in range(len(c)):
                        check_3 = check_2 + c[i_3][0]
                        if check_3 in s:
                            con.append(check_3)
                            if len(con) >= k:
                                break
                            for i_4 in range(len(c)):
                                check_4 = check_3 + c[i_4][0]
                                if check_4 in s:
                                    con.append(check_4)
                                    if len(con) >= k:
                                        break
                                    break
                                break
                            break
                        break
                    break
                break
            break
        break
    n +=1
print(con[k-1])

Fixed code:
import collections

s = input()
k = int(input())
b = collections.Counter(s)
c = sorted(b.items())
con = []
n = 0
while True:
    con.append(c[n][0])
    if len(con) == k:
        break
    for i in range(len(c)):
        check = c[n][0] + c[i][0]
        if check in s:
            con.append(check)
            if len(con) >= k:
                break
            for i_2 in range(len(c)):
                check_2 = check + c[i_2][0]
                if check_2 in s:
                    con.append(check_2)
                    if len(con) >= k:
                        break
                    for i_3 in range(len(c)):
                        check_3 = check_2 + c[i_3][0]
                        if check_3 in s:
                            con.append(check_3)
                            if len(con) >= k:
                                break
                            for i_4 in range(len(c)):
                                check_4 = check_3 + c[i_4][0]
                                if check_4 in s:
                                    con.append(check_4)
                                    if len(con) >= k:
                                        break
    if len(con) >= k:
        break                              
    n +=1
print(con[k-1])
Buggy code:
s = input()
k = int(input())
t = sorted(s)[k-1]
data = []
for i in range(len(s)):
    if s[i] <= t:
        data.append(s[i:])
data.sort()
if len(data) > k:
    data = data[:k]

ndata = []
for ss in data:
    for i in range(len(ss)):
        ndata.append(ss[:i+1])
ndata = list(set(ndata))
ndata.sort()
print(ndata[k-1])

Fixed code:
s = input()
k = int(input())
t = sorted(s)[min(k-1,len(s)-1)]
data = []
for i in range(len(s)):
    if s[i] <= t:
        data.append(s[i:])
data.sort()
if len(data) > k:
    data = data[:k]

ndata = []
for ss in data:
    for i in range(len(ss)):
        ndata.append(ss[:i+1])
ndata = list(set(ndata))
ndata.sort()
print(ndata[k-1])
Buggy code:
s = input()
k = int(input())
n = len(s)

substring = []

for i in range(min(n, k)):
    for j in range(n-i):
        substring.append(s[j:j+i+1])
        print(s[j:j+i+1], j, j+i+1)

substring = list(set(substring))
substring.sort()
print(substring)
#substring.pop(0)

print(substring[k-1])



Fixed code:
s = input()
k = int(input())
n = len(s)

substring = []

for i in range(min(n, k)):
    for j in range(n-i):
        substring.append(s[j:j+i+1])
        #print(s[j:j+i+1], j, j+i+1)

substring = list(set(substring))
substring.sort()
#print(substring)
#substring.pop(0)

print(substring[k-1])
Buggy code:
s = input()
r = []
for i in range(1,6):
  for j in range(len(s)-i):
    r.append(s[j:j+i])
print(sorted((set(r)))[int(input())-1])

Fixed code:
s = input()
r = []
for i in range(1,6):
  for j in range(len(s)-i+1):
    r.append(s[j:j+i])
print(sorted((set(r)))[int(input())-1])
Buggy code:
def main():
    s = input()
    K = int(input())
    ind = []
    for i in range(len(s)):
        for j in range(i+1, min(len(s)+1, i+6)):
            ind.append(s[i:j])
    ind = sorted(list(ind))
    print(ind[K-1])

if __name__ == "__main__":
    main()

Fixed code:
def main():
    s = input()
    K = int(input())
    ind = []
    for i in range(len(s)):
        for j in range(i+1, min(len(s)+1, i+6)):
            ind.append(s[i:j])
    ind = sorted(list(set(list(ind))))
    # print(ind)
    print(ind[K-1])

if __name__ == "__main__":
    main()
Buggy code:
s=input()
k=int(input())
a={}
for i in range(k):
  for j in range(len(s)-i):a.append(s[j:j+i+1])
print(sorted(list(a))[k-1])

Fixed code:
s=input()
k=int(input())
a={s}
for i in range(k):
  for j in range(len(s)-i):a.add(s[j:j+i+1])
print(sorted(list(a))[k-1])
Buggy code:
s=input()
K=int(input())

def rec(s):
    ret=set()
    for depth in range(len(s)):
        string=s[depth]
        ret.add(string)
        for i in range(depth+1,length):
            string+=s[i]
            ret.add(string)
    return ret

a=rec(s)
print(sorted(a)[K-1])

Fixed code:
s=input()
K=int(input())
 
def rec(s):
    length=len(s)
    ret=set()
    for depth in range(length):
        string=s[depth]
        ret.add(string)
        for i in range(depth+1,depth+K):
            if i<length:
                string+=s[i]
                ret.add(string)
    return ret
  
ret=rec(s)
print(sorted(ret)[K-1])
Buggy code:
def solve():
    S = input()
    K = int(input())

    N = len(S)

    st = set()

    for left in range(N-1):
        for right in range(left+1,N+1):
            if right - left > K:
                break
            st.add(S[left:right])
    
    tmp = list(st)
    tmp.sort()
    print(tmp[K-1])

if __name__ == '__main__':
    solve()

Fixed code:
def solve():
    S = input()
    K = int(input())

    N = len(S)

    st = set()

    for left in range(N):
        for right in range(left+1,N+1):
            if right - left > K:
                break
            st.add(S[left:right])
    
    tmp = list(st)
    tmp.sort()
    print(tmp[K-1])

if __name__ == '__main__':
    solve()