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

func getChiwawa(_ cnt:Int, _ startIdx:Int)->Int {
    var nextChar:Character = "w"
    if(cnt == 0) {
        nextChar = "c"
    }
    for i in startIdx..<inpt.count {
        if(inpt[i] == nextChar) {
            if(cnt == 2) {
                return i
            } else {
                let ret = getChiwawa(cnt+1, i+1)
                if(ret < 0) {
                    return ret;
                } else if(cnt == 0) {
                    return ret - i + 1
                } else {
                    return ret;
                }
            }
        }
    }
    return -1
}

let ans = getChiwawa(0, 0)
print(ans)