fun main() {
    val builder = StringBuilder()

    val n = readInputLine().toInt()

    repeat(n) {
        val (a, b) = readInputLine().split(" ").map { it.toLong() }
        val ansRev = mutableListOf<Long>()

        var current = b

        while (current != a) {
            var maxDiv = 1L
            for (i in LongRange(1L, current)) {
                if (i * i > current || current - i < a) {
                    break
                }
                if (current % i != 0L) {
                    continue
                }
                if (current - i >= a) {
                    maxDiv = i
                }
                if (current - current / i >= a) {
                    maxDiv = current / i
                    break
                }
            }
            ansRev.add(maxDiv)
            current -= maxDiv
        }

        builder.appendln(ansRev.size)
        builder.appendln(ansRev.reversed().joinToString(" "))
    }

    print(builder.toString())
}

fun readInputLine(): String {
    return readLine()!!
}