#!/usr/bin/env perl
use warnings;
use v5.14;
binmode STDOUT, 'utf8';
binmode DATA, 'encoding(utf-8)';
 
while (<DATA>) {
    chomp;
    print $_, ': ';
    s/[A-Za-z]//g;
    my $alphacount = () = /\p{Alpha}/g;
    say "non-[A-Za-z] symbols <$_> contain $alphacount alphabetic characters";
}

__DATA__
æðaber
æðahnútur
æðakölkun
æðardúnn
æðarfugl
æðarkolla
æðarkóngur
æðarvarp
æðruorð