a A a b b b b c d D e e e e E E e f F F f f f f f f f f f f f f 
z z z z z z z x x x x x x x x x y y Y y g 
$hash{A}: 1
$hash{D}: 1
$hash{E}: 2
$hash{F}: 2
$hash{Y}: 1
$hash{a}: 2
$hash{b}: 4
$hash{c}: 1
$hash{d}: 1
$hash{e}: 5
$hash{f}: 13
$hash{g}: 1
$hash{x}: 9
$hash{y}: 3
$hash{z}: 7

Char: 'f' has the highest count: 13!