#include <iostream>
#include <vector>
using namespace std;
int main() {
vector<int> v;
v.push_back(1);
if(v.size() - 2 < 0)
cout << ":)";
else
cout << ":(";
return 0;
}
I2luY2x1ZGUgPGlvc3RyZWFtPgojaW5jbHVkZSA8dmVjdG9yPgp1c2luZyBuYW1lc3BhY2Ugc3RkOwoKaW50IG1haW4oKSB7Cgl2ZWN0b3I8aW50PiB2OwoJdi5wdXNoX2JhY2soMSk7CglpZih2LnNpemUoKSAtIDIgPCAwKQoJCWNvdXQgPDwgIjopIjsKCWVsc2UKCQljb3V0IDw8ICI6KCI7CglyZXR1cm4gMDsKfQ==