s=input()
east=s.find("OOO")
west=s.find("XXX")
if east==-1 and west==-1:
    print("NA")
elif east==-1 or west==-1:
    if east==-1:
        print("West")
    else:
        print("East")
else:
    if east<west:
        print("East")
    else:
        print("West")