#include <stdio.h>

int main(void)
{
	char a[11],b[11],i;
	short an,bn;
	scanf("%s",a);
	scanf("%s",b);

	an = 0; bn = 0;
	for (i=0;i<11;i++) {
		if (a[i]=='\0' || b[i]=='\0') break;
		an += a[i];
		bn += b[i];
	}

	if (an==bn) printf("YES\n");
	else printf("NO\n");

	return 0;
}