#include<stdio.h>

int main()
{
  char a[11],b[11];
  int alphaa[26],alphab[26];
  int i,count=0;

  for (i=0;i<26;i++) {
    alphaa[i]=0;
    alphab[i]=0;
  }

  scanf("%s",a);
  scanf("%s",b);

  i=0;

  while (a[i]!='\0') {
    alphaa[a[i]-'a']++;
    alphab[b[i]-'a']++;
    i++;
  }

  for (i=0;i<26;i++) {
    if (alphaa[i]!=alphab[i]) {
      count++;
      break;
    }
  }

  if (count==0) {
    printf("YES\n");
  } else {
    printf("NO\n");
  }

  return 0;
}