dict = {
        'a' => 0, 'b' => 0, 'c' => 0, 'd' => 0, 'e' => 0, 'f' => 0, 'g' => 0,
        'h' => 0, 'i' => 0, 'j' => 0, 'k' => 0, 'l' => 0, 'm' => 0, 'n' => 0,
        'o' => 0, 'p' => 0, 'q' => 0, 'r' => 0, 's' => 0, 't' => 0, 'u' => 0,
        'v' => 0, 'w' => 0, 'x' => 0, 'y' => 0, 'z' => 0
}
while true
        line = STDIN.gets
        line.downcase.chars {|c|
                dict[c] += 1 if c.match(/[a-z]/)
        }
        break if line.match(/\.$/)
end

dict.each {|k,v|
        puts k + ' : ' + v.to_s
}