Nmap

hello, I am stuck in Enamuration it says: “Enumerate all ports and their services. One of the services contains the flag you have to submit as the answer” I have done that only 3 ports are open 21, 80, 111 then I used command nc -nv IP and each port. it coonected with port 80, now what should I type in the answer box
services name and ports show incorrect when i typed them