Problem:
Score : 300 points

Problem Statement

1000000000000001 dogs suddenly appeared under the roof of Roger's house, all of which he decided to keep. The dogs had been numbered 1 through 1000000000000001, but he gave them new names, as follows:

the dogs numbered 1,2,\cdots,26 were respectively given the names a, b, ..., z;

the dogs numbered 27,28,29,\cdots,701,702 were respectively given the names aa, ab, ac, ..., zy, zz;

the dogs numbered 703,704,705,\cdots,18277,18278 were respectively given the names aaa, aab, aac, ..., zzy, zzz;

the dogs numbered 18279,18280,18281,\cdots,475253,475254 were respectively given the names aaaa, aaab, aaac, ..., zzzy, zzzz;

the dogs numbered 475255,475256,\cdots were respectively given the names aaaaa, aaaab, ...;

and so on.

To sum it up, the dogs numbered 1, 2, \cdots were respectively given the following names:

a, b, ..., z, aa, ab, ..., az, ba, bb, ..., bz, ..., za, zb, ..., zz, aaa, aab, ..., aaz, aba, abb, ..., abz, ..., zzz, aaaa, ...

Now, Roger asks you:

"What is the name for the dog numbered N?"

Constraints

N is an integer.

1 \leq N \leq 1000000000000001

Input

Input is given from Standard Input in the following format:

N

Output

Print the answer to Roger's question as a string consisting of lowercase English letters.

Sample Input 1

2

Sample Output 1

b

Sample Input 2

27

Sample Output 2

aa

Sample Input 3

123456789

Sample Output 3

jjddja

Solution in Python (3.8.2) (judge verdict: Runtime Error)

N = int(input())
q = [0]*11
i = 10
n = N
cflag = 0
str = []
while i != -1:
    q[i] = n // 26 ** i
    mod = n % 26 ** i
    n = mod
    i -= 1
for i in range(11):
    if q[i] == 0 and q[i+1] == 0:
        break
    elif q[i] == 0:
        str.append("z")
        cflag = 1
    elif q[i] == 1 and q[i+1] == 0 and cflag == 1:
        break
    elif q[i] == 1 and cflag == 1:
        str.append ("z")
    else:
        str.append(chr(q[i] + 96 -cflag))
        cflag = 0

i = len(str) -1
while i >= 0:
    if[str] == '':
        i-=1
        continue
    elif i == 0:
        print(str[i])
        break
    else:
        print(str[i], end="")
        i -= 1