Floodfill string rep:
0, 0, 54, 20 -> ZZZYRLMSUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUU.ZZYQKKKLSUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUU.ZZUKKKKKMTUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUU.YYNKKKKKKOUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUU.YVLKKKKKKLSUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUU.ZTLKKKNQTTSUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUU.ZULKMVYZZYTTLHLHHHMTPJHHJSUUUSKHHIOTSJHKHHIOTTJIRUUUNH.VMNQUZZZZZVTKFFFFFFJGFFFFHQUSIFFFFFMRIFFFFFFNTHHRUUUMF.UUXZZZZZZZVTKFHOQNHFFLQPJFKSLFIQRNFGQIFHPQMGGPHHRUUUMF.RPSUPOPSWYVTKFNUUULFKTUUSFGRHFIJJJGFJIGPUUUKFLHHRUUULF.SRKLKJJKMRUTKFRUUUNFMUUUTFGRHFFEEEEEIIGSUUULFLHHQUUUKF.SYNKKKKKKKNTKFRUUUNFMUUUUFGRJFKRRQPRQIGSUUULFMJFLTUSHF.QXWPLKKKKKPTKFRUUUNFMUUUUFGSPGFIKFHRRIGSUUULFMQFFIKGFF.KSYYTKKKKKRTKFRUUUNFMUUUUFGSTOGFEFJRRHGSUUULFMTNGFEFFF.KNXZYPKKKOTURPTUUUSPRUUUUPPTUUSQPRTUTQPTUUURPRUUSPPRQP.KLWZZWLKLSUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUU.KKVZZYPKRUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUU.KLWZZXRQTUTUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUU.KNXYVSRTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTT.JMSRQRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRR