import "hashes/sha256/512bitPacked" as sha256packed;

def main(private field a, private field b, private field c, private field d) {
    field[2] h = sha256packed([a, b, c, d]);
    assert(h[0] == 263561599766550617289250058199814760685);
    assert(h[1] == 65303172752238645975888084098459749904);
    return;
}