Morse code is made up of dots and dashes. How did telegraph operators keep from losing track of where one letter ended and another began?

Question

In the movies, morse code comes through so fast it’s hard to tell a dot from a dash. Hoe did they keep from getting lost?

In: 1001

Answer 1

Had master morse code expert who could listen to three streams of morse at the same time. Just like you can follow three speakers. At a party.