# Copyright (c) 2010 The Mirah project authors. All Rights Reserved.
# All contributing project authors may be found in the NOTICE file.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
#      http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.



def rot13 (value:String)
    result = ""
    d = ' '.toCharArray[0]
    value.toCharArray.each do |c|
        testChar = Character.toLowerCase(c)
        if testChar <= 'm'.toCharArray[0] && testChar >= 'a'.toCharArray[0] then
            d = char(c + 13)
        end
        if testChar <= 'z'.toCharArray[0] && testChar >= 'n'.toCharArray[0] then
            d = char(c - 13)
        end
        result += d
    end
    result
end


puts rot13("abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ")