def product( str: String) = {
        /* calculate product of the unicode codes of all letters
        in a string. F.e. "Hello"  is 825152896 */
        var result : BigInt = 1
        for(c <- str)  result = result * c

        result
    }

    def product1 (str: String) = {
        /* Writing product function without cycles */
        var result : BigInt = 1
        str.foreach(result *= _)
        //println(result)

        result
    }