Write a Python program to check whether a triangle can be formed given the lengths of its three sides (sum of any two sides must be greater than the third).
Three space-separated numbers representing side lengths.
Print 'Valid' or 'Invalid'.
Side lengths > 0
3 4 5
Valid
A triangle is valid if a + b > c, b + c > a, and a + c > b.
# Write your code here
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