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

main()
{
	char a[1000], b[1000], s[1000];
	int  i, La, Lb, C;

	printf("Input a very long positive integer:");
	gets(a);

	printf("Input another very long positive integer:");
	gets(b);

	La=strlen(a);
	Lb=strlen(b);
	if(La<Lb) {
		strcpy(s,a);
		strcpy(a,b);
		strcpy(b,s);
	}
	La=strlen(a);
	Lb=strlen(b);
	s[0]='0';
	s[1]=0;
	C=0;

	s[La+1]=0;
	for(i=0; i<La;i++){
		if(i<Lb) {
			s[La-i] = a[La-1-i] - '0' + b[Lb-1-i] + C;
			if(s[La-i]>'9') {
				C=1;
				s[La-i] -= 10;
			}
			else C=0;
		}
		else {
			s[La-i] = a[La-1-i] + C;
							if(s[La-i]>'9') {
				C=1;
				s[La-i] -= 10;
			}
			else C=0;
		}
	}
	printf("%s+%s=%s\n", a, b, s);
}