Waiting or Not Waiting

Raju maths teacher gave him a task of identifying the number name. If the number is greater than 0 then he should utter to the teacher as "I am waiting". If the number is less than 0 then he should utter the word as "I am not waiting". If the number is "0" the he should utter the word as "Sorry". Help him by completing his task. 

 a=int(input()) 
if a == 0: 
 print("Sorry") 
if a > 0: 
 print("I am waiting") 
if a < 0: 
 print("I am not waiting")

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