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

int mas[100000];

int main()
{
    FILE *fin, *fout;
    char st[10000], symb;
    int ind_high, i, quantity, flag;
    fin = fopen("brackets.in", "r");
    fout = fopen("brackets.out", "w");
    while (fgets(st, 10000, fin) != NULL)
    {
        ind_high = 0;
        flag = 0;
        quantity = 0;
        for (i = 0; i < strlen(st); i++)
        {
            symb = st[i];
            if (symb == '(')
            {
                mas[ind_high++] = 1;
                quantity++;
            }
            else if (symb == '[')
            {
                mas[ind_high++] = 2;
                quantity++;
            }
            else if (symb == ')')
            {
                if ((quantity > 0) && (mas[ind_high - 1] == 1))
                {
                    mas[ind_high - 1] = 0;
                    ind_high--;
                    quantity--;
                }
                else
                {
                    fprintf(fout, "NO\n");
                    flag++;
                    break;
                }
            }
            else if (symb == ']')
            {
                if ((quantity > 0) && (mas[ind_high - 1] == 2))
                {
                    mas[ind_high - 1] = 0;
                    ind_high--;
                    quantity--;
                }
                else
                {
                    fprintf(fout, "NO\n");
                    flag++;
                    break;
                }
            }
        }
        if (flag == 0)
        {
            if (quantity == 0)
                fprintf(fout, "YES\n");
            else
                fprintf(fout, "NO\n");
        }
    }

    fclose(fin);
    fclose(fout);
    return 0;
}