#!/usr/bin/env ruby

if __FILE__ == $0 then
	s = gets.split('').map(&:ord)
    s.size.times do |i|
        if s[i] > 0x40 and (s[i]-0x41)%0x20 < 0x1a then
            s[i]^=0x20
		end
	end
	puts s.map(&:chr).join('')
end

