s=input()
a=0
b=0
for i in range(len(s)):
    if s[i]=="O":
        a+=1
        b=0
    else:
        b+=1
        a=0
    if max(a,b)==3:
        break
if a==3:
    print("East")
elif b==3:
    print("West")
else:
    print("NA")