Complete the program that reads one word at a time to build and print a sentence with a single blank space between each word.

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Complete the following program that reads one word at a time to build and print a sentence with a single blank space between each word.

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word $=$ input$()$ # First word

sentence $=$ word

while not word.endswith$(".")$ :

sentence $+=""+$ word

word $=$ input$("$Next word: $")$

sentence $+=""+$ word

print$($sentence$)$