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)

n = int(input())

    
string = []
count = 0
info = []
while n > 26**count:
    count += 1
count -= 1
while count >= 0:
    tem = n // 26**count
    info.append(tem)
    n -= 26**count * tem
    count -= 1
    

for i in info:
    if i == 1:
        string.append("a")
    elif i == 2:
        string.append("b")
    elif i == 3:
        string.append("c")
    elif i == 4:
        string.append("d")
    elif i == 5:
        string.append("e")
    elif i == 6:
        string.append("f")
    elif i == 7:
        string.append("g")
    elif i == 8:
        string.append("h")
    elif i == 9:
        string.append("i")
    elif i == 10:
        string.append("j")
    elif i == 11:
        string.append("k")
    elif i == 12:
        string.append("l")
    elif i == 13:
        string.append("m")
    elif i == 14:
        string.append("n")
    elif i == 15:
        string.append("o")
    elif i == 16:
        string.append("p")
    elif i == 17:
        string.append("q")
    elif i == 18:
        string.append("r")
    elif i == 19:
        string.append("s")
    elif i == 20:
        string.append("t")
    elif i == 21:
        string.append("u")
    elif i == 22:
        string.append("v")
    elif i == 23:
        string.append("w")
    elif i == 24:
        string.append("x")
    elif i == 25:
        string.append("y")
    elif i == 26:
        string.append("z")

print("".join(string))