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

void sort(char *a, int size){
  int i, j;
  char tmp;

  for(i = 0 ; i < size-1; i++){
    for(j = size-1; j > i; j--){
      if(a[j-1] > a[j]){
	tmp = a[j-1];
	a[j-1] = a[j];
	a[j] = tmp;
      }
    }
  }
}
int main(void){
  int i;
  char A[10], B[10];
  scanf("%s", A);
  scanf("%s", B);
  i = 0;
  while(A[i] != '\0') i++;
  sort(A, i);
  i = 0;
  while(B[i] != '\0') i++;
  sort(B, i);
  if(strcmp(A, B)) printf("NO\n");
  else printf("YES\n");
  return 0;
}