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

#define PRECISION  11 // including the end of string

#define END(pointer)\
	pointer + (int)(strlen(pointer)-1)*sizeof(char)

#define MIDDLE(pointer)\
	pointer + (int)(strlen(pointer)/2)*sizeof(char)

char add (char *out, char operand, char *norm_carry){
if (*out == '\0') *out = 48;
char result = *out - 48 + operand -48+ *norm_carry ;
*out = (result % 10) + 48;
*norm_carry = (result/10);

//printf("result %d operand %d carry %d \n",result, operand, *norm_carry);

return 	*(out+sizeof(char));
}

void reverse(char *begin, char *end , char *dest_element ){
	char temp;

while (begin != dest_element && end !=dest_element){

	temp = (*begin) ;//
	(*begin) = (*end);
	(*end) = temp;

	begin += 1;
	end -= 1;
   }

	temp = (*begin) ;//
	(*begin) = (*end);
	(*end) = temp;
}

int main (){
char *a,*b, *result = NULL,*toadd = NULL, carry = 0;
FILE *in, *out;
int min_size, max_size, i ;

// init
if ((in = fopen ("adunare.in", "r")) == NULL) { printf ("Could not open infile\n"); return -1; }
if (( out = fopen ("adunare.out", "w+"))== NULL){ printf ("Could not open outfile\n"); return -1; }

a = (char *) malloc (sizeof(char) * PRECISION);
b = (char *) malloc (sizeof(char) * PRECISION);

memset(a,48,sizeof(char)*PRECISION);
memset(b,48,sizeof(char)*PRECISION);

//read
fscanf (in,"%s\n",a );
fscanf (in , "%s\n", b);
//reverse 
reverse( a, a + (int )( strlen(a) - 1 ) * sizeof(char), a + (int)(strlen(a) / 2)*sizeof(char) );
reverse( b, END(b), MIDDLE(b));
//add


if (strlen (a)> strlen (b)){
	min_size = strlen(b);
	max_size = strlen (a);
	result = a;
	toadd = b;
}
else{
	min_size = strlen (a);
	max_size = strlen (b);
	result = b;
	toadd = a;
}

//size = (strlen(a)<strlen(b)  )? strlen(a) : strlen(b);
for (i = 0 ; i < min_size ; i++){ // basic adding
	 add(result + i, toadd[i], &carry);
}// case in which carry is non zero

while (carry != 0){
       add (result+i,'0',&carry);
       i++;
	result[i] = '\0';
}

reverse (result , END(result), MIDDLE(result));
fprintf (out, "%s\n", result);//

fclose(in);
fclose(out);

return 0;
}