Score : 1000 points

Problem Statement

Welcome to CODE FESTIVAL 2016! In order to celebrate this contest, find a string s that satisfies the following conditions:

  • The length of s is between 1 and 5000, inclusive.
  • s consists of uppercase letters.
  • s contains exactly K occurrences of the string "FESTIVAL" as a subsequence. In other words, there are exactly K tuples of integers (i_0, i_1, ..., i_7) such that 0 ≤ i_0 < i_1 < ... < i_7 ≤ |s|-1 and s[i_0]='F', s[i_1]='E', ..., s[i_7]='L'.

It can be proved that under the given constraints, the solution always exists. In case there are multiple possible solutions, you can output any.

Constraints

  • 1 ≤ K ≤ 10^{18}

Input

The input is given from Standard Input in the following format:

K

Output

Print a string that satisfies the conditions.

Sample Input 1

7

Sample Output 1

FESSSSSSSTIVAL

Sample Input 2

256

Sample Output 2

FFEESSTTIIVVAALL