... because after 11 count one character is incrementing so not printing aligned format ...

See sprintf.

perl -Mstrict -Mwarnings -E '
my @x = qw/ 123 1234567890 12345678901 /;
say sprintf("%-11s length %s", $_, length $_) for @x;
'
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Output:

123         length 3
1234567890  length 10
12345678901 length 11
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Hope this helps!