import collections
N,K = map(int,input().split())
S = input()
D = collections.deque(list('xx'))
NO = collections.deque()
for i in range(N):
    D.append(S[i])
    NO.append(i+1)
    if D[-2]=='(' and D[-1]==')':
        D.pop()
        D.pop()
        R = NO.pop()
        L = NO.pop()
        if R == K :
            print(L)
        if L == K :
            print(R)