function g()
	local a = string.byte("a")
	local d = a - string.byte("A")
	return function (s)
		local r, _ = s:gsub(".", function (e)
			e = string.byte(e)
			return e >= a and string.char(e-d) or string.char(e+d)
		end)
		return r
	end
end

local s = io.stdin:read("*l")
local f = g()

print(f(s))