#!/usr/bin/ruby
 
j =
{"RGY"=>{"2"=>"RGB", "6"=>"BGY", "T"=>"RBY"},
 "RYG"=>{"4"=>"RBG", "8"=>"RYB", "D"=>"BYG"},
 "RYB"=>{"2"=>"RYG", "6"=>"GYB", "T"=>"RGB"},
 "RBY"=>{"4"=>"RGY", "8"=>"RBG", "D"=>"GBY"},
 "RBG"=>{"2"=>"RBY", "6"=>"YBG", "T"=>"RYG"},
 "RGB"=>{"4"=>"RYB", "8"=>"RGY", "D"=>"YGB"},
 
 "GYR"=>{"2"=>"GYB", "6"=>"BYR", "T"=>"GBR"},
 "GRY"=>{"4"=>"GBY", "8"=>"GRB", "D"=>"BRY"},
 "GBY"=>{"2"=>"GBR", "6"=>"RBY", "T"=>"GRY"},
 "GYB"=>{"4"=>"GRB", "8"=>"GYR", "D"=>"RYB"},
 "GRB"=>{"2"=>"GRY", "6"=>"YRB", "T"=>"GYB"},
 "GBR"=>{"4"=>"GYR", "8"=>"GBY", "D"=>"YBR"},
 
 "BRY"=>{"2"=>"BRG", "6"=>"GRY", "T"=>"BGY"},
 "BYR"=>{"4"=>"BGR", "8"=>"BYG", "D"=>"GYR"},
 "BYG"=>{"2"=>"BYR", "6"=>"RYG", "T"=>"BRG"},
 "BGY"=>{"4"=>"BRY", "8"=>"BGR", "D"=>"RGY"},
 "BGR"=>{"2"=>"BGY", "6"=>"YGR", "T"=>"BYR"},
 "BRG"=>{"4"=>"BYG", "8"=>"BRY", "D"=>"YRG"},
 
 "YBR"=>{"2"=>"YBG", "6"=>"GBR", "T"=>"YGR"},
 "YRB"=>{"4"=>"YGB", "8"=>"YRG", "D"=>"GRB"},
 "YRG"=>{"2"=>"YRB", "6"=>"BRG", "T"=>"YBG"},
 "YGR"=>{"4"=>"YBR", "8"=>"YGB", "D"=>"BGR"},
 "YGB"=>{"2"=>"YGR", "6"=>"RGB", "T"=>"YRB"},
 "YBG"=>{"4"=>"YRG", "8"=>"YBR", "D"=>"RBG"}}
 
while gets
	state = "RBG"
	print "Y" unless $_.chomp.empty?
 
	$_.chomp.each_char do |roll|
		print (["Y", "R", "G", "B"] - (state = j[state][roll]).split(//))[0].chr
	end
	print "\n"
end