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function out = atbash(in)
vals = double(in); % Cast the string input into a vector of doubles
upperind = find(in >= 65 & in <= 90); % Find all upper case letters
lowerind = find(in >=97 & in <= 122); % Find all lower case letters
in(upperind) = 155 - in(upperind); % Apply the appropriate numerical changes to
                           % indices of the original string that are
                           % uppercase.
in(lowerind) = 219 - in(lowerind); % Apply the appropriate numerical changes to
                           % indices of the original string that are
                           % lowercase.
 % Cast the resulting vector back into a string
other= find(in>0 & in< 65 | in>90 & in<97 | in>122)
in(other) = vals(other)
out = num2str(char(in([1:1:length(in)])))
end