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 Go (1.14.1) (judge verdict: Wrong Answer)

package main

import (
	"fmt"
)

func main() {
	var n int
	fmt.Scan(&n)

	num26 := []int{}
	for true {
		t := n % 26
		num26 = append(num26, t)

		m := n / 26
		if m <= 26 {
			if m != 0 {
				num26 = append(num26, m)
			}
			break
		}

		n = (n - t) / 26
	}

	fmt.Println(num26)

	abc := []string{}
	z := false
	for i := 0; i < len(num26); i++ {
		if num26[i] == 0 {
			abc = append(abc, "z")
			z = true
			continue
		}
		if z {
			if i == len(num26)-1 && num26[i] == 1 {
				break
			}
			if i == len(num26)-1 {
				s := fmt.Sprintf("%q", num26[i]+95)
				abc = append(abc, string(s[1]))
				break
			}
			s := fmt.Sprintf("%q", num26[i]+96)
			abc = append(abc, string(s[1]))
			z = false
		} else {
			s := fmt.Sprintf("%q", num26[i]+96)
			abc = append(abc, string(s[1]))
		}
	}

	for i := len(abc) - 1; i >= 0; i-- {
		fmt.Print(abc[i])
	}
	fmt.Println()
}