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: Wrong Answer)

MAX = 500
  
# Function to print Excel column name  
# for a given column number 
def printString(n): 
  
    # To store result (Excel column name) 
    string = ["\0"] * MAX
  
    # To store current index in str which is result 
    i = 0
  
    while n > 0: 
        # Find remainder 
        rem = n % 26
  
        # if remainder is 0, then a  
        # 'Z' must be there in output 
        if rem == 0: 
            string[i] = 'z'
            i += 1
            n = (n // 26) - 1
        else: 
            string[i] = chr((rem - 1) + ord('a')) 
            i += 1
            n = n // 26
    string[i] = '\0'
  
    # Reverse the string and print result 
    string = string[::-1] 
    print("".join(string))

printString(int(input()))