decaesar.rb

def uncipher(str)
  1.upto(26) do |shift|
    key = Hash[('a'..'z').zip((97..122).collect{ |i| if (i+shift > 122) then ((i + shift) % 122) + 96 else i+shift end })].merge({' '=>' '.ord,','=>','.ord,'.'=>'.'.ord,'?'=>'?'.ord,'!'=>'!'.ord})
    freqs = Hash.new(0)
    tmp = str.split('').collect { |letter| switched = (key[letter]).chr; freqs[switched] += 1; switched }
    total = 0
    freqs.each { |e| total += e[1] }
    puts tmp.join if freqs['e']/total.to_f * 100 > 7 and freqs['t']/total.to_f * 100 > 5 # Might want to eventually make more accomodating
  end
end
uncipher(gets.chomp)