Uva 10469 - To Carry or not to Carry

/*

CODEMAN

ARIF KHAN NIHAR

uva 10469 - To Carry or not to Carry

*/

#include <stdio.h>

int main(){

unsigned int a, b;

while(scanf("%u %u", &a, &b) != EOF){

printf("%u\n", a ^ b);

}

return 0;

}