n:{.:x@&~(x<"0")|x>"9"}

+/n'm:{(1_-6#-1_x)~5#!=v@>{(+/x=*x),-*x}'v,\:v:-7_x^"-01234567890"}#0:"day04"
/ 361724

n@*{"north"~5#`c$"a"+26!(n@x)+x-"a"}#m
/ 482