#include <stdio.h>
#include <stdlib.h>
#include <stdbool.h>
#include <string.h>
#include <math.h>
#define REP(i, n) for (ll i = 0; i < n; i++)
#define REP1(i, n) for (ll i = 1; i <= n; i++)
#define RREP(i, n) for (ll i = n - 1; i >= 0; i--)
#define RREP1(i, n) for (ll i = n; i >= 1; i--)
#define FOR(i, a, b, c) for (ll i = a; i <= b; i += c)
#define RFOR(i, a, b, c) for (ll i = a; i >= b; i -= c)
#define MAX(a, b) (a > b ? a : b)
#define MIN(a, b) (a < b ? a : b)
#define SORT(t, a, n) qsort(a, n, sizeof(t), ({ int _f (const void *_a, const void *_b) { return *(t *)_a - *(t *)_b; } _f; }));
#define RSORT(t, a, n) qsort(a, n, sizeof(t), ({ int _f (const void *_a, const void *_b) { return *(t *)_b - *(t *)_a; } _f; }));
#define SUM(t, a, n) ({ t _s = 0; REP(i, n) _s += a[i]; _s; })
#define CNT(t, x, a, n) ({ t _c = 0; REP(i, n) if (a[i] == x) _c++; _c; })
#define INF 1145141919
typedef long long ll;

int main() {
    char a[11], b[11];
    scanf("%s %s", a, b);

    SORT(char, a, strlen(a));
    SORT(char, b, strlen(b));
    if (strcmp(a, b)) puts("NO");
    else puts("YES");
    return 0;
}