al = ['A', 'B', 'C']
print(len(al))
al.append('D')
print(al)
al.insert(0, '0')
print(al)

971a8f4c99e7de2c69306192e537d7860009675a
<mask token>

<mask token>
print(len(al))
al.append('D')
print(al)
al.insert(0, '0')
print(al)

al = ['A', 'B', 'C']
print(len(al))
al.append('D')
print(al)
al.insert(0, '0')
print(al)
