Topic 1126: Or A+b

Title Description

Read in two positive integers a and B less than 10000, calculate a+b. It is important to note that if the end of A and B (not more than 8) digits are the same, please output-1 directly.

Input

The test input contains several test cases, one row for each test case, the format "A B K", and two adjacent numbers with a space interval. When A and B are at the end of the 0 o'clock input, the corresponding result is not output.

Output

Output 1 rows For each test case, that is, the value of a+b or 1.

Sample input

2 3 1

12 22 1

11 111 2

0 0 2

Sample output

5

-1

-1

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Source

2006 Zhejiang University computer and software engineering research on the real problem of life test

/********************************* 
 *    Date: 2013-3-18
 *    Author: SJF0115 
 *    question number: Tian Qin topic 1126: or A+b
 *    Source: http://acmclub.com/problem.php?id=1126
 *    Result: AC 
 *    Source: 2006 Research on computer and software engineering of Zhejiang University The real Problem of life test
 *    Summary: 
**********************************/
#include <stdio.h>
#include < stdlib.h>

int main ()
{
	int k,a,b,n;
	Freopen ("C:\\users\\sjf\\desktop\\acm.txt", "R", stdin); 
	while (scanf ("%d%d", &a,&b)! = EOF) {
		if (A = = 0 && B = = 0) {break
			;
		}
		scanf ("%d", &k);
		n = 1;
		while (k--) {
			n *=;
		}
		Determine if K-bit is
		the same if (A% n = = B% n) {
			printf (" -1\n");
		}
		else{
			printf ("%d\n", a+b);
		}
	}
    return 0;
}