zpwBZqZ4lmtcXcd3BhMTS+xAlqoXdQP46YfVhXt+XfFsmPQfImO06hq7DaQcDwBT7wOJhvu8RaAZ2R2P0rk4lS9VfFB++gMPte24CtNExTw=

PO₄³⁻ + S

1. Solve the chemical reaction above in order to decode the above text.
2. Key size = x²−256x+16384=0
3. Your answer is at 1:50.