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         bytes              chars
36353935 ----> 36 35 39 35  ---->  6 5 9 5
                                   | | | |
       first 4 digits      reverse | | | |
595661 -------------> 5956 ------> 6 5 9 5

#! /usr/bin/perl
use warnings;
...
             2e4, 3e5, 4e6, 5e7, 6e8, 7e9, 8e10, 9e11, 2 ** 64 - 3;

done_testing();

reverse($input) % 10_000

($q=q:Sq=~/;[c](.)(.)/;chr(-||-|5+lengthSq)`"S|oS2"`map{chr |+ord
}map{substrSq`S_+|`|}3E|-|`7**2-3:)=~y+S|`+$1,++print+eval$q,q,a,