c

#include <stdio.h>
int main(void)
{
	freopen("input.txt","r",stdin);
	freopen("output.txt","w",stdout);
	unsigned short numb[6]={0};
	int i;
	for(i=0;i<6;i++)
	{
		scanf("%c",&numb[i]);
		printf("%hu\n",numb[i]);
	}
	printf("%s",(numb[0]+numb[1]+numb[2]==numb[3]+numb[4]+numb[5]) ? "YES\n" : "NO\n");
	fclose(stdin);
	fclose(stdout);
	return 0;
}