I faced out with some problems, when tried to read unicode strings from the file. It was smth like: 
open FH, '<:utf8', 'input.txt'
    or die $!
my $str = <FH>;
close FH;

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This file contains one letter. In the hex editor it looks like: 
C3 A0

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And in the text editor it is "à". I think it is italian.
When I tried to 
print $str;

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I expected "Wide character in print" and this letter after, but all that I get is question mark inside black box "�".
Here are quick examples: 
echo -e "\xC3\xA0" | perl -pne 'BEGIN{binmode STDIN, ":utf8"}'
echo -e "\xD0\xBC" | perl -pne 'BEGIN{binmode STDIN, ":utf8"}'

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output of the first example is as described above, but second works as expected (with "Wide character in print" and expected letter - "м" - from the cyrillic alphabet)
Please, tell me where is a problem.

In reply to Unicode problem with some letters by OlegG

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