working with Python Dictionary

working with Python Dictionary

I have the code below :

message=input(">")
words=message.split(' ')
print (words)
emoh={
    ":)":"😂",
    ":(":"😒"
}
output=""
for word in words:
    print(word,word,word,word,word)
    print (emoh.get(word))
    output+= (emoh.get(word,word))
print (output)

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When I run it , I get the result below:


The question is why I am getting the "None" ?

Thank you