print("n=123")
print("f=456.789")
print("s1=\'Hello,world\' ")
print('s2=\'Hello,\\\'Adam\\\" ')
print('s3=r\'Hello,\"Bart\"\' ')
print('s4=r\'\'\'Hello,Lisa!\'\'\' ')
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湖与海海
print("n=123")
print("f=456.789")
print("s1=\'Hello,world\' ")
print('s2=\'Hello,\\\'Adam\\\" ')
print('s3=r\'Hello,\"Bart\"\' ')
print('s4=r\'\'\'Hello,Lisa!\'\'\' ')