print('hello world');

classmates=['Michael','Bob','Tracy']
print(len(classmates));
print(classmates[-1]);
classmates.append('Admin')
print(classmates);
classmates.insert(1,'jack')
print(classmates)
age =10
if age>=18:
    print('your age is',age)
    print('adult')
else:
    print('teenager')

names=['Michael','Bob','Tracy']
for name in names:
    print(name)