s = input()

def judge(s):
    count = 1
    temp = s[0]

    if len(s) < 3:
        return 'NA'

    for i in s[1:]:
        if i == temp:
            count += 1
            if count == 3:
                if i == "O":
                    return 'East'
                else:
                    return 'West'
        else:
            temp = i
            count = 1
    
    return 'NA'

print(judge(s))