input: Write a function to find the team with the most wins.
  assert find_team_with_most_wins(teams_wins) == "A's"
  teams_wins['E's'] = 60
  assert find_team_with_most_wins(teams_wins) == "E's"
  teams_wins['F's'] = 60
  assert find_team_with_most_wins(teams_wins) == "E's" or find_team_with_most_wins(teams_wins) == "F's"
output: def find_team_with_most_wins(teams_wins):
      return max(teams_wins, key=teams_wins.get)