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

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

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