N,Q = map(int,input().split())
S = input()
bit = [0] * N
def add(i,x):
    while i <= N-1:
        bit[i] += x
        i += i & -i
def getsum(i):
    ans = 0
    while i > 0:
        ans += bit[i]
        i -= i & -i
    return ans
l = list(S)
for i in range(N-1):
    if l[i] == '(' and l[i+1] == ')':
        add(i+1,1)
for _ in range(Q):
    t = list(map(int,input().split()))
    if t[0] == 2:
        print(getsum(t[2]-1)-getsum(t[1]-1))
    else:
        i = t[1]
        if l[i-1] == '(':
            if i < N and l[i] == ')':
                add(i,-1)
            if i >= 2 and l[i-2] == '(':
                add(i-1,1)
            l[i-1] = ')'
        else:
            if i >= 2 and l[i-2] == '(':
                add(i-1,-1)
            if i < N and l[i] == ')':
                add(i,1)
            l[i-1] == '('