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 Perl (5.26.1) (judge verdict: Wrong Answer)

use strict;
use warnings;
use POSIX qw/ floor  /;
use feature 'say';
use Data::Dumper;

chomp(my $count = <STDIN>);
my @alphabets = ('a' .. 'z');

{
  my @nums = ();

  sub divider {
    my $n = shift;

    while ( $n >= 26 ) {
      my $div = $n / 26;
      my $mod = $n % 26;
      if( $mod == 0) {
        push(@nums, $div);
        return @nums;
      } else {
        divider( $div );

        push(@nums, $mod);
        return @nums;
      }
    }

    push(@nums, $n);
    return @nums;

  }
}

my @elms = divider($count);

my $str = '';
for my $i (@elms ) {
  my $ind = floor($i) - 1;
  $str .= $alphabets[$ind];
}
say $str;