class BIT
  attr_accessor(:arr, :size)
  def initialize(n)
    @size = n
    @arr = Array.new(@size+1,0)
  end
  def add(i,x)
    i += 1
    while i <= @size
      @arr[i] += x
      i += i & -i
    end
  end
  def sum(i)
    i += 1
    sum = 0
    while i > 0
      sum += @arr[i]
      i &= i - 1
    end
    sum
  end
end

n,q = gets.split.map(&:to_i)
s = gets.chomp.chars
bit = BIT.new(n)
n.times do |i|
  next if i==0
  if s[i] == ")" && s[i-1] == "("
    bit.add(i,1)
  end
end
ans = []
q.times do
  query = gets.split.map(&:to_i)
  if query[0]==1
    i = query[1]-1
    if s[i] == "("
      if 0 <= i-1 && s[i-1] == "("
        bit.add(i,1)
      end
      if i+1 < n && s[i+1] == ")"
        bit.add(i+1,-1)
      end
      s[i] = ")"
    else
      if 0 <= i-1 && s[i-1] == "("
        bit.add(i,-1)
      end
      if i+1 < n && s[i+1] == ")"
        bit.add(i+1,1)
      end
      s[i] = "("
    end
  else
    l,r = query[1]-1,query[2]-1
    ans << bit.sum(r) - bit.sum(l)
  end
end
puts ans