Balanced Subarrays

An array $A$ of length $3N$ is said to be *balanced* if it contains exactly $N$ occurrences each of $1,2,$ and $3$. For example, the arrays $[1, 2, 1, 3, 3, 2]$ and $[3, 2, 1]$ are *balanced*, whereas $[1, 1, 1], [1, 2, 1, 2, 1, 2],$ and $[3, 2, 1, 1, 3, 3]$ are not. You are given an integer $K$ ($1 \leq K \leq 10^7$). Construct *any* array $A$ of length **at most** $10^4$, consisting of only