open class Letter(hash: BigInteger, var lineHeight: Int) {
    var pixels: Int = countBinaryOnes(hash)
    var hash: BigInteger = hash
    set(value) {
        pixels = countBinaryOnes(hash)
        field = value
    }
}

class DeterminedLetter(val char: Char, hash: BigInteger, lineHeight: Int): Letter(hash, lineHeight) {
    private class Params(val char: Char, val hash: BigInteger, val lineHeight: Int)
    private constructor(params: Params): this(params.char, params.hash, params.lineHeight)
    constructor(line: String): this(constructFromString(line))
    constructor(char: Char, letter: Letter): this(char, letter.hash, letter.lineHeight)
    companion object {
        private fun constructFromString(line: String): Params {
            val pair = line.split(',')
            val char = pair[0].toInt().toChar()
            val lineHeight = pair[1].toInt()
            val hash = pair[2].toBigInteger()
            return Params(char, hash, lineHeight)
        }
    }
}