object Main extends App {
  val o = io.StdIn.readLine
  val e = io.StdIn.readLine

  val n = o.length

  if (o.length == e.length) {
    val result = for (index <- 0 until n) yield o(index).toString+e(index).toString
    println(result.mkString)
  } else {
    val pre_result = for (index <- 0 until n-1) yield o(index).toString+e(index).toString
    val result = pre_result:+o.last
    println(result.mkString)
  }
}