#include <stdio.h>

typedef struct Edge {
	struct Edge *next;
	int v;
} edge;

int par[200003][20];

int main()
{
	int i, N, Q;
	char S[200003];
	scanf("%d %d", &N, &Q);
	scanf("%s", S);
	
	int u, w, M = 0, stack[200003], head = 0, indeg[200003] = {}, mate[200003], flag[200003];
	edge *adj[200003] = {}, e[200003], *p;
	for (i = 0; i < N; i++) {
		if (S[i] == '(') stack[head++] = i + 1;
		else {
			head--;
			mate[i+1] = stack[head];
			mate[stack[head]] = i + 1;
			flag[i+1] = -1;
			flag[stack[head]] = 1;
			if (head == 0) continue;
			u = stack[head-1];
			w = stack[head];
			e[M].v = w;
			e[M].next = adj[u];
			adj[u] = &(e[M++]);
			indeg[w]++;
		}
	}
	
	int j, x, depth[200003], q[200003], tail;
	for (i = 1, depth[0] = -1; i <= N; i++) {
		if (indeg[i] != 0 || flag[i] < 0) continue;
		q[0] = i;
		depth[i] = 0;
		par[i][0] = 0;
		for (head = 0, tail = 1; head < tail; head++) {
			u = q[head];
			for (p = adj[u]; p != NULL; p = p->next) {
				w = p->v;
				depth[w] = depth[u] + 1;
				par[w][0] = u;
				for (j = 1, x = par[u][0]; x != 0; par[w][j] = x, x = par[x][j++]);
				par[w][j] = 0;
				q[tail++] = w;
			}
		}
	}
	
	for (i = 1; i <= Q; i++) {
		scanf("%d %d", &u, &w);
		if (flag[u] < 0) u = mate[u];
		if (flag[w] < 0) w = mate[w];
		while (depth[u] > depth[w]) {
			for (j = 0; depth[par[u][j+1]] >= depth[w]; j++);
			u = par[u][j];
		}
		while (depth[w] > depth[u]) {
			for (j = 0; depth[par[w][j+1]] >= depth[u]; j++);
			w = par[w][j];
		}
		while (u != w) {
			for (j = 0; par[u][j+1] != par[w][j+1]; j++);
			u = par[u][j];
			w = par[w][j];
		}
		if (u != 0) printf("%d %d\n", u, mate[u]);
		else printf("-1\n");
	}
	fflush(stdout);
	return 0;
}