#include <iostream>
using namespace std;
int main() {
int a, b;
while (cin >> a >> b) {
cout << "a = " << a << ", b = " << b << "\n";
}
cout << "cin evaluated to false; treat this as end-of-input\n";
}
I2luY2x1ZGUgPGlvc3RyZWFtPgp1c2luZyBuYW1lc3BhY2Ugc3RkOwoKaW50IG1haW4oKSB7CglpbnQgYSwgYjsKCXdoaWxlIChjaW4gPj4gYSA+PiBiKSB7CgkJY291dCA8PCAiYSA9ICIgPDwgYSA8PCAiLCBiID0gIiA8PCBiIDw8ICJcbiI7Cgl9Cgljb3V0IDw8ICJjaW4gZXZhbHVhdGVkIHRvIGZhbHNlOyB0cmVhdCB0aGlzIGFzIGVuZC1vZi1pbnB1dFxuIjsKfQ==