Write it, run it, read the output

This is a scratch drill — your code runs, nothing is graded or recorded. No test cases, no expected output, no verdict.

TASK

Build the vector as [4, 2, 7], update index 1 to 6, append 1, and remove the appended element. Print the final size on one line and the final elements separated by spaces on the next line.

3
4 6 7