subjects = ['av', 'ac', 'ji', 'et']
print(len(subjects))
subjects.append('toc')
print(subjects)
subjects.insert(3,'hu')
print(subjects)
subjects.remove('et')
print(subjects)
subjects.sort()
print(subjects)
subjects.pop()
print(subjects)
subjects.pop()
print(subjects)
subjects.clear()
print(subjects)
subjects2 = subjects.copy()
print(subjects2)
subjects3 = ['meio', 'rrt', 'kuio', 'rrt']
print(subjects3)
pos = subjects3.index('rrt')
print(pos)
pos = subjects3.count('rrt')
print(pos)
 



