Python letter guess game

Python guess letter game, if there is list of a word 'panda' as L = ['panda'], then it will show to user '-----' at first. Then let user start to input letter, if user input 'a' then it should be show '-a--a'. And then if user input 'p' it should show 'pa--a'. If user input a wrong letter it should show an error. Program end until the all the letter been guessed correctly.