S=list(input())

if len(S)>2:
    N=len(S)-2
    for i in range(0, N):
        if S[i]==S[i+1]:
            if S[i+1]==S[i+2]:
                m=i
                break
            else:
                m=-1
        else:
            m=-1

    if m>-1:
        if S[m]=="O":
            print("East")
        else:
            print("West")
    else:
        print("NA")
    
else:
    print("NA")