#include <bits/stdc++.h>
#define forn(i,s,t) for(register int i=(s); i<=(t); ++i)
#define form(i,s,t) for(register int i=(s); i>=(t); --i)
#define rep(i,s,t) for(register int i=(s); i<(t); ++i)
using namespace std;
const int N = 2e5 + 4; 
vector<int> T[N]; int sl;
int n, q; char s[N]; int dep[N], stk[N], top, l[N], r[N], tai[N], up[20][N]; 
void dfs(int u) {
	forn (i, 1, 19) up[i][u] = up[i - 1][up[i - 1][u]];
	for (int v : T[u]) up[0][v] = u, dep[v] = dep[u] + 1, dfs(v);
}
inline int lca(int u, int v) {
	if (dep[u] < dep[v]) swap(u, v);
	int lft = dep[u] - dep[v];
	for (int i = 0; lft; lft >>= 1, ++i)
		if (lft & 1) u = up[i][u];
	if (u == v) return u;
	form (i, 19, 0) if (up[i][u] != up[i][v])
		u = up[i][u], v = up[i][v];
	return up[0][u];
}
int main() {
	scanf("%d%d", &n, &q);
	scanf("%s", s + 1);
	forn (i, 1, n) {
		if (s[i] == '(') stk[++top] = i, tai[i] = ++sl;
		else {
			T[tai[stk[top - 1]]].push_back(tai[stk[top]]);
			tai[i] = tai[stk[top]];
			r[tai[i]] = i, l[tai[i]] = stk[top]; top -- ;
		}
	}
	dfs(0);
	while (q--) {
		int a, b;
		scanf("%d%d", &a, &b);
		int lc = lca(tai[a], tai[b]);
		if (lc == 0) printf("-1\n");
		else printf("%d %d\n", l[lc], r[lc]);
	}
	return 0;
}