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sub revstring {
 
	my $stringa = shift;
	my $newstring = reverse $stringa ; 
 
	return $newstring;
 
}
 
my $a = "panos";
print $a;
my $b = reverse $a;
print $b;
my $c = revstring($a);
print revstring($c);
print revstring($b);
print revstring($a);

1. revstring                :  Reverses a string