S = input()
S = S + "zOOOXXX"
a = S.find("OOO")
b = S.find("XXX")
c = S.count("OOO")
d = S.count("XXX")
if c == 1 and d == 1 :
    print("NA")
elif c != 1 and d != 1 :
    if a < b :
        print("East")
    else :
        print("West")
elif d == 1 :
    print("East")
else :
    print("West")