import scala.collection.immutable
import scala.io.StdIn.readLine


@main def main =
  val Array(n, q) = readLine().split(' ').map(_.toInt)
  val s = readLine()
  val queries = Array.fill(q){
    val Array(x, y) = readLine().split(' ').map(_.toInt - 1)
    x -> y
  }
  var stack = Nil: List[Int]
  val pair = Array.fill(n){-1}
  for (c, i) <- s.zipWithIndex do
    c match
      case '(' => stack ::= i
      case ')' =>
        val h::t = stack
        pair(i) = h
        pair(h) = i
        stack = t
  val set = Array.fill(n){immutable.TreeSet[Int]()}
  for i <- 0 until n do
    if i > 0 then
      set(i) = set(i - 1)
    if s(i) == '(' then
      set(i) += pair(i)
    else
      set(i) = set(i - 1)
  for (x, y) <- queries do
    val result = set(x).rangeFrom(y).headOption.map(right => s"${pair(right) + 1} ${right + 1}").getOrElse("-1")
    println(result)