def isinvalid (str)

	bus = 0

	until str =~ /^W*$/
		isvalid = str =~ /^(W*?)WG([WG]*?)R(.*)$/
		return true unless isvalid

		str = "#{$1}#{$2}#{$3}"

	end

	false
end

def main ()
	flandre = gets.chomp.to_i(10)

	for i in 0...flandre do
		str = gets.chomp
		x = ""
		x << "im" if isinvalid(str)
		puts x << "possible"
	end
end

main()