Untitled

while True:

    # User Input
    side1 = int(input("Enter the first side of triangle: "))
    side2 = int(input("Enter the second side of triangle: "))
    side3 = int(input("Enter the third side of triangle: "))

    # Stop looping if there's any negative input value
    if side1 < 0 or side2 < 0 or side3 < 0:
        break

    # Condition of not a triangle
    if side1 + side2 <= side3 or side1 + side3 <= side2 or side2 + side3 <= side1:
        print("Not a triangle")
    else:

        # Classify the triangle
        if side1 != side2 != side3:
            print("Scalene triangle")
        elif side1 == side2 == side3:
            print("Equilateral triangle")
        else:
            print("Isosceles triangle")