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)