Script to see missing letters

ph = [[The quick brown fox jumps over the lazy dog]]

ph = string.upper(ph)
s = ""

for i=0,25 do

c = string.char(65 + i)
f = string.find(ph, c)

if (f == nil) then
 s = s .. c .. ", "
end

end

s = string.sub(s, 0, s:len() - 2)

if (s == "") then
print("No letters are missing")
else
print("The letters " .. s .. " are missing")
end