import sys
readline=sys.stdin.readline

def Run_Length(lst):
    run_length=[]
    if lst:
        prev=lst[0]
        cnt=1
        for x in lst[1:]:
            if x==prev:
                cnt+=1
            else:
                run_length.append((prev,cnt))
                prev=x
                cnt=1
        run_length.append((prev,cnt))
    return run_length

S=readline().rstrip()
for s,c in Run_Length(S):
    if c>=3:
        if s=="O":
            ans="East"
        else:
            ans="West"
        break
else:
    ans="NA"
print(ans)