let inpt = readLine()!.map{$0}

var ans = "NA"

if(inpt.count >= 3) {
    for i in 2..<inpt.count {
        if(inpt[i]==inpt[i-1]&&inpt[i]==inpt[i-2]) {
            ans = inpt[i]=="O" ? "East" : "West"
            break
        }
    }
}

print(ans)