#include<stdio.h>
int main(void){
int a = 0, i = 0, j = 0, k = 0, l = 0, temp;
char A[10], B[10];
scanf ("%s%s", A, B);
while ( A[l] != '\0'){
	l++;
}

for (i = 0; i < l - 1; i++){
	for (j = i + 1; j < l; j++){
		if ( A[i] > A[j]){
			temp = A[i];
			A[i] = A[j];
			A[j] = temp;
		}
		
	}
}
for (i = 0; i < l - 1; i++){
	for (j = i + 1; j < l; j++){
		if ( B[i] > B[j]){
			temp = B[i];
			B[i] = B[j];
			B[j] = temp;
		}
	}
}
while (a < l){
	if(A[k] == B[k]){
	k++;
	}
a++;
}	

if ( k == l)
printf ("YES");
else
printf ("NO");
	return 0;
}