import java.io.PrintWriter
import java.util.*

fun PrintWriter.solve() {
    val n = nextInt()
    val p = Array(n) { nextInt() }
    val x = Array(n) { n + 1 }
    val y = Array(n) { n + 1 }
    var cur = 0
    for (i in 0 until n) {
        val v = p[i]
        var left = 0
        var right = n
        while (right - left > 1) {
            val mid = (left + right) / 2
            if (y[mid] < v) {
                left = mid
            } else {
                right = mid
            }
        }
        if (y[left] < v) {
            y[right] = v
        } else {
            y[left] = v
        }
        if (y[cur] != n + 1) {
            x[cur] = i + 1
            cur++
        }
    }
    for (i in 0 until n) {
        if (y[i] == n + 1) break
        println("${x[i]} ${y[i]}")
    }
}

fun main() {
    val writer = PrintWriter(System.out, false)
    writer.solve()
    writer.flush()
}

// region Scanner
private var st = StringTokenizer("")
private val br = System.`in`.bufferedReader()

fun next(): String {
    while (!st.hasMoreTokens()) st = StringTokenizer(br.readLine())
    return st.nextToken()
}

fun nextInt() = next().toInt()
fun nextLong() = next().toLong()
fun nextLine() = br.readLine()
fun nextDouble() = next().toDouble()
// endregion