#include <stdio.h>
#include <string.h>

int JudgeMatch(char *s)
{
	char t[500];
	int top = -1,i = 0;
	while(s[i] != '\0')
	{
		while(s[i] == '[' || s[i] == '(')
			t[++top] = s[i++];
		if((s[i] == ')' && t[top] == '(') || (s[i] == ']' && t[top] == '['))
			i++,top--;
		else return 0;
	}
	return 1;
}

int main()
{
	char s[1000];
	gets(s);
	if(JudgeMatch(s)) printf("YES\n");
	else printf("NO\n");
	return 0;
}