杭电-2057 A + B Again

Problem Description
There must be many A + B problems in our HDOJ , now a new one is coming.

Give you two hexadecimal integers , your task is to calculate the sum of them,and print it in hexadecimal too.

Easy ? AC it !

Input
The input contains several test cases, please process to the end of the file.

Each case consists of two hexadecimal integers A and B in a line seperated by a blank.

The length of A and B is less than 15.

Output
For each test case,print the sum of A and B in hexadecimal in one line.

Sample Input

+A -A
+1A 12
1A -9
-1A -12
1A -AA

Sample Output

0
2C
11
-2C
-90

#include<stdio.h>
int main()
{
	long long a,b;
	
	while(~scanf("%I64X %I64X",&a,&b))
	{
		b+=a;
		if(b<0)
		{
			printf("-");
			b=-b;
		}
		printf("%I64X\n",b);
	}
}