849_C. From Y to Y
From beginning till end, this message has been waiting to be conveyed.

For a given unordered multiset of n lowercase English letters ("multi" means that a letter may appear more than once), we treat all letters as strings of length 1, and repeat the following operation n - 1 times:

  * Remove any two elements s and t from the set, and add their concatenation s + t to the set. 



The cost of such operation is defined to be <image>, where f(s, c) denotes the number of times character c appears in string s.

Given a non-negative integer k, construct any valid non-empty set of no more than 100 000 letters, such that the minimum accumulative cost of the whole process is exactly k. It can be shown that a solution always exists.

Input

The first and only line of input contains a non-negative integer k (0 ≤ k ≤ 100 000) — the required minimum cost.

Output

Output a non-empty string of no more than 100 000 lowercase English letters — any multiset satisfying the requirements, concatenated to be a string.

Note that the printed string doesn't need to be the final concatenated string. It only needs to represent an unordered multiset of letters.

Examples

Input

12


Output

abababab


Input

3


Output

codeforces

Note

For the multiset {'a', 'b', 'a', 'b', 'a', 'b', 'a', 'b'}, one of the ways to complete the process is as follows:

  * {"ab", "a", "b", "a", "b", "a", "b"}, with a cost of 0; 
  * {"aba", "b", "a", "b", "a", "b"}, with a cost of 1; 
  * {"abab", "a", "b", "a", "b"}, with a cost of 1; 
  * {"abab", "ab", "a", "b"}, with a cost of 0; 
  * {"abab", "aba", "b"}, with a cost of 1; 
  * {"abab", "abab"}, with a cost of 1; 
  * {"abababab"}, with a cost of 8. 



The total cost is 12, and it can be proved to be the minimum cost of the process.
```python
from math import sqrt


def readln(): return map(int, input().rstrip().split())


def possible(n): return n * (n + 1) // 2


charset = 'abcdefghijklmnopqrstuvwxyz'
ci = 0
n = int(input())
rs = []
while n > 0:
    for i in range(int(sqrt(n) + 1), 0, -1):
        if n >= possible(i):
            n -= possible(i)
            rs.extend([charset[ci]] * (i + 1))
            ci += 1
else:
    if not rs:
        rs.append('a')
print(''.join(rs))

```