Buggy python submission (verdict: Runtime Error):
s = input()
K = int(input())
alphabet = list("abcdefghijklmnopqrstuvwxyz")
result = []

for u in alphabet:
    for i in range(len(s)):
        if s[i] == u:
            for j in range(i + 1, min(i + K + 1, len(s) + 1)):
                result.append(s[i:j])
    if len(result) > K:
        break

result = list(set(result))
result.sort()
# print(result)
# print(len(result))
print(result[K - 1])


Fixed submission:
s = input()
K = int(input())
subs = []
for i in range(0, len(s)):
    for j in range(i + 1, K + i + 1 if i + K <= len(s) else len(s) + 1):
        subs.append(s[i:j])


subs = list(set(subs))

subs.sort()
print(subs[K - 1])

Buggy python submission (verdict: Runtime Error):
s = input()
K = int(input())
subs = []
alphabet = list("abcdefghijklmnopqrstuvwxyz")
result = []

for u in alphabet:
    for i in range(len(s)):
        if s[i] == u:
            for j in range(i + 1, min(i + K + 1, len(s) + 1)):
                result.append(s[i:j])


subs = list(set(subs))
subs.sort()
print(subs[K - 1])


Fixed submission:
s = input()
K = int(input())
subs = []
for i in range(0, len(s)):
    for j in range(i + 1, K + i + 1 if i + K <= len(s) else len(s) + 1):
        subs.append(s[i:j])


subs = list(set(subs))

subs.sort()
print(subs[K - 1])

Buggy python submission (verdict: Runtime Error):
s = input()
K = int(input())
result = []
alphabet = list("abcdefghijklmnopqrstuvwxyz")

for u in alphabet:
    for i in range(len(s)):
        if s[i] == u:
            for j in range(i + 1, min(i + K + 1, len(s) + 1)):
                result.append(s[i:j])
    if len(result) > K:
        break

result = list(set(result))
result.sort()
# print(result)
# print(len(result))
print(result[K - 1])


Fixed submission:
s = input()
K = int(input())
subs = []
for i in range(0, len(s)):
    for j in range(i + 1, K + i + 1 if i + K <= len(s) else len(s) + 1):
        subs.append(s[i:j])


subs = list(set(subs))

subs.sort()
print(subs[K - 1])

Buggy python submission (verdict: Runtime Error):
s = input()
K = int(input())
result = []
alphabet = list("abcdefghijklmnopqrstuvwxyz")

for u in alphabet:
    for i in range(len(s)):
        if s[i] == u:
            for j in range(min(K, len(s) - i)):
                result.append(s[i:i + j + 1])
    if len(result) > K:
        break

result = list(set(result))
result.sort()
# print(result)
# print(len(result))
print(result[K - 1])


Fixed submission:
s = input()
K = int(input())
subs = []
for i in range(0, len(s)):
    for j in range(i + 1, K + i + 1 if i + K <= len(s) else len(s) + 1):
        subs.append(s[i:j])


subs = list(set(subs))

subs.sort()
print(subs[K - 1])

Buggy python submission (verdict: Runtime Error):
s = input()
K = int(input())
result = []
alphabet = list("abcdefghijklmnopqrstuvwxyz")

for u in alphabet:
    for i in range(len(s)):
        if s[i] == u:
            for j in range(min(K, len(s) - i)):
                result.append(s[i:i + j + 1])
    if len(result) > K:
        break
result = list(set(result))
result.sort()
print(result[K - 1])


Fixed submission:
s = input()
K = int(input())
subs = []
for i in range(0, len(s)):
    for j in range(i + 1, K + i + 1 if i + K <= len(s) else len(s) + 1):
        subs.append(s[i:j])


subs = list(set(subs))

subs.sort()
print(subs[K - 1])

Buggy python submission (verdict: Runtime Error):
s = input()
K = int(input())
result = []
alphabet = list("abcdefghijklmnopqrstuvwxyz")

for u in alphabet:
    for i in range(len(s)):
        if s[i] == u:
            for j in range(K):
                result.append(s[i:i + j + 1])
    if len(result) > K:
        break
result = list(set(result))
result.sort()
print(result[K - 1])


Fixed submission:
s = input()
K = int(input())
subs = []
for i in range(0, len(s)):
    for j in range(i + 1, K + i + 1 if i + K <= len(s) else len(s) + 1):
        subs.append(s[i:j])


subs = list(set(subs))

subs.sort()
print(subs[K - 1])

Buggy python submission (verdict: Runtime Error):
s = input()
K = int(input())
result = []
alphabet = list("abcdefghijklmnopqrstuvwxyz")

for u in alphabet:
    for i in range(len(s)):
        if s[i] == u:
            for j in range(len(s) - i):
                result.append(s[i:i + j + 1])
    if len(result) > K:
        break
result = list(set(result))
result.sort()
print(result[K - 1])


Fixed submission:
s = input()
K = int(input())
subs = []
for i in range(0, len(s)):
    for j in range(i + 1, K + i + 1 if i + K <= len(s) else len(s) + 1):
        subs.append(s[i:j])


subs = list(set(subs))

subs.sort()
print(subs[K - 1])

Buggy python submission (verdict: Runtime Error):
s = input()
K = int(input())
result = []
alphabet = list("abcdefghijklmnopqrstuvwxyz")

for u in alphabet:
    for i in range(len(s)):
        if s[i] == u:
            for j in range(len(s) - i):
                result.append(s[i:i + j + 1])
    if len(result) > K:
        break
result = list(set(result))
result.sort()
print(result)
print(result[K - 1])


Fixed submission:
s = input()
K = int(input())
subs = []
for i in range(0, len(s)):
    for j in range(i + 1, K + i + 1 if i + K <= len(s) else len(s) + 1):
        subs.append(s[i:j])


subs = list(set(subs))

subs.sort()
print(subs[K - 1])