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Write a console program with a main function that prompts the user for numbers until the user types -1, then outputs the sum of the numbers. Here is an example output:

Type a number: 10
Type a number: 20
Type a number: 30
Type a number: -1
Sum is 60
Type your Kotlin solution code here:

This is a function exercise. Write a Kotlin function as described. Do not write a complete program; just the function(s) above.

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