string.split(" ").map { |word| word.chars.map{ |char| (('a'..'z').to_a.include? char)? ('a'..'z').to_a[(('a'..'z').to_a.index(char) + shift)%26] : ('A'..'Z').to_a.include?(char)? ('A'..'Z').to_a[(('A'..'Z').to_a.index(char) + shift)%26] : char }.join}.join(" ")