Workbook

print("Hello World!") #hello World line

username = input()
password = input()
passwordlength = len(password)
maskedpassword = '*' * passwordlength
print(f'Hi {username}, you password ({maskedpassword}) is {passwordlength} characters long')

sample = '0123456789'
print(sample[6:3:-1])

matrix = [[0,1,2],[3,4,5],[6,7,8,9,0],['a','b','c'],0]

matrix.insert(2,100)

matrix1 = matrix[:][:]

matrix2 = matrix1.append(['test','method'])
matrix.remove(0)
#matrix.pop(0)
matrix.insert(2,100)
matrix1.append(9.45)
matrix1.append('y')
matrix1[4].append('x')
matrix1[1].append('y')
matrix.extend(['asd','add'])
print(matrix)
print(matrix1)
print(len(matrix1))
print(len(matrix1[4]))
print(type(matrix1))
print(type(matrix1[2]))
print(type(matrix1[4]))
print(type(matrix1[5]))
print(matrix2)