List trend$\_$data contains integers read from input, representing a sequence of data values. For each index i of trend$\_$data from $1$ through the second$-$to$-$last index:

The element at index i is a dunk if the element is less than both the preceding element and the following element.

If the element at index i is a dunk, then output 'Dunk: $\text{'},$ followed by the preceding element, the current element, and the following element, separating each element by a space.