results = input()
west = results.find("XXX"); east = results.find("OOO")

if (west == -1) and (east == -1):
    print("NA")
else:
    if west == -1:
        print("East")
    elif east == -1:
        print("West")
    else:
        if   west < east:
            print("West")
        elif west > east:
            print("East")