fun main() {
    val builder = StringBuilder()

    val n = readInputLine().toInt()

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

        while (a != b) {
            val gcd = gcd(a, b)
            if ((a / gcd) % 2L == 1L) {
                ans.add(gcd)
                a += gcd
            } else {
                ansRev.add(gcd)
                b -= gcd
            }
        }

        builder.appendln(ans.size + ansRev.size)
        if (ans.isNotEmpty()) {
            builder.append(ans.joinToString(" ") + " ")
        }
        builder.appendln(ansRev.reversed().joinToString(" "))
    }

    print(builder.toString())
}

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

tailrec fun gcd(a: Long, b: Long): Long =
    when {
        b > a -> gcd(b, a)
        b == 0L -> a
        else -> gcd(b, a % b)
    }