object Main extends App {
  object Scanner {
    private val buf = new Array[Byte](1024); private var ptr = 0; private var len = 0
    @inline private def isPrintableChar(c: Int): Boolean = 33 <= c && c <= 126
    @inline private def hasNextByte(): Boolean =
      if (ptr >= len) { ptr = 0; len = System.in.read(buf); len > 0 } else { true }
    @inline private def hasNext(): Boolean = {
      while (hasNextByte() && !isPrintableChar(buf(ptr))) ptr += 1
      hasNextByte()
    }
    @inline private def readByte(): Byte =
      if (hasNextByte()) { val res = buf(ptr); ptr += 1; res } else { -1 }
    def next(): String = {

      if(!hasNext()) ???
      val sb = new StringBuilder; var b = readByte()
      while (isPrintableChar(b)) { sb.append(b.toChar); b = readByte() }
      sb.toString
    }
    def nextInt(): Int = {
      val n = nextLong()
      if (n < Int.MinValue || Int.MaxValue < n) ???
      n.toInt
    }
    def nextLong(): Long = {
      if(!hasNext()) ???
      var minus = false; var b = readByte()
      if (b == '-') { minus = true; b = readByte() }
      def go (b: Byte, n: Long = 0): Long =
        if ('0' <= b && b <= '9') { go(readByte(), n * 10 + b - '0') }
        else if (minus) { -n } else { n }
      go(b)
    }
    def nextDouble(): Double = next.toDouble
  }


  val (n, m) = (Scanner.nextInt(), Scanner.nextInt())

  val lines = Array.fill(m,2)(Scanner.nextInt()).map {
    case Array(p, y) => (p, y)
  }
//
//  val (n, m) = readLine.split(" ").map(_.toInt) match {
//    case Array(n, m) => (n, m)
//  }
//
//  val lines: Seq[(Int, Int)] = (1 to m)
//    .map(_ =>
//      readLine.split(" ").map(_.toInt) match {
//        case Array(p, y) => (p, y)
//      })

  val map: Map[Int, Map[Int, Int]] =
    lines
      .groupBy(_._1)
      .mapValues(
        _.sortBy(_._2).zipWithIndex.map {
          case ((p, y), index) => (y, index + 1)
        }.toMap
      )

  def convert(p: Int, order: Int) = f"${p}%06d${order}%06d"
  val pw = new java.io.PrintWriter(System.out)
  lines.map { case (p, y) => convert(p, map(p)(y)) }.foreach{ res =>
    pw.println(res)
  }
  pw.flush
}
