#include<stdio.h>
int main()
{
	char l[101];
	scanf("%s", l,101);
	int judge[101] = { 0 };
	for (int i = 0; l[i]!='\0'; i++)
	{
		if (l[i] == ')')
		{
			for (int a = i-1; a >= 0; a--)
			{
				if ((l[a] == '('||l[a]=='[') && judge[a] == 0)
				{
					if (l[a] == '(')
					{
						judge[i] = 1;
						judge[a] = 1;
					}
					break;
				}
			}
		}
		if (l[i] == ']')
		{
			for (int a = i - 1; a >= 0; a--)
			{
				if (l[a] == '(' || l[a] == '[' && judge[a] == 0)
				{
					if (l[a] == '[')
					{
						judge[i] = 1;
						judge[a] = 1;
					}
					break;
				}
			}
		}
	}
	for (int i = 0; l[i]!='\0'; i++)
	{
		if (judge[i] == 1)
			printf("%c", l[i]);
		else
		{
			if (l[i] == ')')
				printf("()");
			if (l[i] == ']')
				printf("[]");
			if (l[i] == '(')
				printf("()");
			if (l[i] == '[')
				printf("[]");
		}
		//printf("%d", judge[i]);
	}
	return 0;
}