Buggy python submission (verdict: Runtime Error):
n = int(input())
rev = []
nn = n
def c(n):
    k = 1
    i = 1
    while n > 26 ** i:
        n -= 26 ** i
        k += 1
        i += 1
    return n

def d(n):
    k = 1
    i = 1
    while n > 26 ** i:
        n -= 26 ** i
        k += 1
        i += 1
    return k

n = c(n)
while n > 26:
    r = n % 26
    rev.append(r)
    n //= 26
rev.append(n)
sl = list('abcdefghijklmnopqrstuvwxyz')
l = len(rev)
if l >= 2:
    for i in range(1, l):
        rev[i] += 1
name = []

for i in range(d(nn) - l):
    name.append('a')
for i in range(len(rev)):
    d = sl[rev[l - 1 - i] - 1]
    name.append(d)
dogname = ''.join(name)
print(dogname)

Fixed submission:
n = int(input())
rev = []
nn = n
def c(n):
    k = 1
    i = 1
    while n > 26 ** i:
        n -= 26 ** i
        k += 1
        i += 1
    return n

def d(n):
    k = 1
    i = 1
    while n > 26 ** i:
        n -= 26 ** i
        k += 1
        i += 1
    return k

n = c(n) - 1
while n > 25:
    r = n % 26
    rev.append(r)
    n //= 26
rev.append(n)
sl = list('abcdefghijklmnopqrstuvwxyz')
l = len(rev)
name = []
for i in range(d(nn) - l):
    name.append('a')
for i in range(len(rev)):
    d = sl[rev[l - 1 - i]]
    name.append(d)
dogname = ''.join(name)
print(dogname)

Buggy python submission (verdict: Runtime Error):
n = int(input())
rev = []
nn = n
def c(n):
    k = 1
    i = 1
    while n > 26 ** i:
        n -= 26 ** i
        k += 1
        i += 1
    return n

def d(n):
    k = 1
    i = 1
    while n > 26 ** i:
        n -= 26 ** i
        k += 1
        i += 1
    return k

n = c(n)
while n > 26:
    r = n % 26
    rev.append(r)
    n //= 26
rev.append(n)
sl = list('abcdefghijklmnopqrstuvwxyz')
l = len(rev)
for i in range(1, l):
    rev[i] += 1
name = []

for i in range(d(nn) - l):
    name.append('a')
for i in range(len(rev)):
    d = sl[rev[l - 1 - i] - 1]
    name.append(d)
dogname = ''.join(name)
print(dogname)

Fixed submission:
n = int(input())
rev = []
nn = n
def c(n):
    k = 1
    i = 1
    while n > 26 ** i:
        n -= 26 ** i
        k += 1
        i += 1
    return n

def d(n):
    k = 1
    i = 1
    while n > 26 ** i:
        n -= 26 ** i
        k += 1
        i += 1
    return k

n = c(n) - 1
while n > 25:
    r = n % 26
    rev.append(r)
    n //= 26
rev.append(n)
sl = list('abcdefghijklmnopqrstuvwxyz')
l = len(rev)
name = []
for i in range(d(nn) - l):
    name.append('a')
for i in range(len(rev)):
    d = sl[rev[l - 1 - i]]
    name.append(d)
dogname = ''.join(name)
print(dogname)

Buggy python submission (verdict: Runtime Error):
n = int(input())
rev = []
nn = n
def c(n):
    k = 1
    i = 1
    while n > 26 ** i:
        n -= 26 ** i
        k += 1
        i += 1
    return n

def d(n):
    k = 1
    i = 1
    while n > 26 ** i:
        n -= 26 ** i
        k += 1
        i += 1
    return k

n = c(n)
while n > 26:
    r = n % 26
    if r == 0:
        r = 26
    rev.append(r)
    n //= 26
rev.append(n)
sl = list('abcdefghijklmnopqrstuvwxyz')
l = len(rev)
for i in range(1, l):
    rev[i] += 1
name = []

for i in range(d(nn) - l):
    name.append('a')
for i in range(len(rev)):
    d = sl[rev[l - 1 - i] - 1]
    name.append(d)
dogname = ''.join(name)
print(dogname)

Fixed submission:
n = int(input())
rev = []
nn = n
def c(n):
    k = 1
    i = 1
    while n > 26 ** i:
        n -= 26 ** i
        k += 1
        i += 1
    return n

def d(n):
    k = 1
    i = 1
    while n > 26 ** i:
        n -= 26 ** i
        k += 1
        i += 1
    return k

n = c(n) - 1
while n > 25:
    r = n % 26
    rev.append(r)
    n //= 26
rev.append(n)
sl = list('abcdefghijklmnopqrstuvwxyz')
l = len(rev)
name = []
for i in range(d(nn) - l):
    name.append('a')
for i in range(len(rev)):
    d = sl[rev[l - 1 - i]]
    name.append(d)
dogname = ''.join(name)
print(dogname)