#include <iostream>
#include <bitset>
using namespace std;
int main() {
std::bitset<4> a("1001");
std::bitset<4> b("1111");
std::bitset<4> c = a ^ b;
cout << "c: " << c << "\n";
return 0;
}
I2luY2x1ZGUgPGlvc3RyZWFtPgojaW5jbHVkZSA8Yml0c2V0Pgp1c2luZyBuYW1lc3BhY2Ugc3RkOwoKaW50IG1haW4oKSB7CgkKICAgIHN0ZDo6Yml0c2V0PDQ+IGEoIjEwMDEiKTsKICAgIHN0ZDo6Yml0c2V0PDQ+IGIoIjExMTEiKTsKICAgIHN0ZDo6Yml0c2V0PDQ+IGMgPSBhIF4gYjsKICAgIGNvdXQgPDwgImM6ICIgPDwgYyA8PCAiXG4iOwogICAgCglyZXR1cm4gMDsKfQ==