s=input()
t=list(s)
l=len(t)
win=0
lose=0
n=0


while n<=l-1:
    if t[n]=="o":
        win+=1
        lose=0
    else:
        lose+=1
        win=0

    if win==3:
        print("East win!")
        break
    elif lose ==3:
        print("West win!")
        break
    elif n==l-1:
        print("NA")
        break

    n+=1