use PYTHON 3 please!

5 Good Input Loop Letters Problem Submissions Leaderboard Discussions You have asked the user to enter a letter from 'a-z'. Knowing the user won't always do as asked, you should ignore any character that is not between 'a-z' and continue getting input until a letter between 'a-z' is entered. Once it has been entered, output that letter. Input Format A series of individual characters Constraints One character Output Format Output the first proper input