#define _CRT_SECURE_NO_WARNINGS
#include <stdio.h>
#include <iostream>
#include <string>
#include <algorithm>
#include <cstring>
#include <assert.h>

using namespace std;

int main() {
    int n;
    long long int k;
    scanf("%d %lld", &n, &k);
    long long int** dp = new long long int*[2 * n + 1];
    for (int i = 0; i <= 2 * n; i++) {
        dp[i] = new long long int[2 * n];
        for (int j = 0; j <= 2 * n; j++)
            dp[i][j] = 0;
    }
    dp[2 * n][0] = 1;
    for (int i = 2 * n - 1; i >= 0; i--) {
        for (int j = 0; j <= 2 * n; j++) {
            dp[i][j] = 0;
            if (j > 0) dp[i][j] += dp[i + 1][j - 1];
            if (j < 2 * n) dp[i][j] += 2 * dp[i + 1][j + 1];
        }
    }
    long long int w = 0;
    char* stk = new char[2 * n];
    int s = 0;
    int bal = 0;
    k--;
    for (int i = 0; i < 2 * n; i++) {
        long long int cnt = 0;
        if (s > 0 && stk[s - 1] == '(') cnt += dp[i + 1][bal - 1];
        if (s > 0 && stk[s - 1] == '[' && w + 2 * dp[i + 1][bal + 1] <= k) {
            printf("]");
            s--;
            w += 2 * dp[i + 1][bal + 1];
            bal--;
        }
        else if (dp[i + 1][bal + 1] > 0 && w + dp[i + 1][bal + 1] + cnt <= k) {
            printf("[");
            stk[s++] = '[';
            w += dp[i + 1][bal + 1] + cnt;
            bal++;
        }
        else if (s > 0 && stk[s - 1] == '(' && w + dp[i + 1][bal + 1] <= k) {
            printf(")");
            s--;
            w += dp[i + 1][bal + 1];
            bal--;
        }
        else {
            printf("(");
            bal++;
            stk[s++] = '(';
        }
    }
    system("pause");
    return 0;
}