Ana and Beto play against each other. Initially, Ana chooses a non-negative integer $N$ and announces it to Beto. Next Beto writes a succession of $2016$ numbers, $1008$ of them equal to $1$ and $1008$ of them equal to $-1$. Once this is done, Ana must split the succession into several blocks of consecutive terms (each term belonging to exactly one block), and calculate the sum of the numbers of each block. Finally, add the squares of the calculated numbers. If this sum is equal to $N$, Ana wins. If not, Beto wins. Determine all values of $N$ for which Ana can ensure victory, no matter how Beto plays.
1. **Necessary Condition:**
   - Ana must split the sequence into blocks such that the sum of the squares of the sums of these blocks equals \( N \).
   - Consider the sequence \( (1, -1, 1, -1, \dots, 1, -1) \). The sum of any block Ana can make is \(-1\), \(0\), or \(1\).
   - If a block sums to \(-1\) or \(1\), it contains an odd number of terms. If a block sums to \(0\), it contains an even number of terms.
   - Since there are \(1008\) ones and \(1008\) negative ones, the total sum of the sequence is \(0\).
   - Therefore, the number of blocks that sum to \(-1\) or \(1\) must be even, implying \( N \) must be even.

2. **Sufficient Condition:**
   - We need to show that for any even \( N \) from \(0\) to \(2016\), Ana can always split the sequence to achieve \( N \).
   - Consider the sequence of \(2016\) numbers with \(1008\) ones and \(1008\) negative ones.
   - If \( N = 0 \), Ana can take the entire sequence as one block, resulting in a sum of \(0\), and \(0^2 = 0\).
   - For \( N = 2 \), Ana can split the sequence into two blocks, each summing to \(1\) and \(-1\), respectively. The sum of squares is \(1^2 + (-1)^2 = 1 + 1 = 2\).
   - For \( N = 4 \), Ana can split the sequence into four blocks, each summing to \(1\) or \(-1\). The sum of squares is \(1^2 + 1^2 + (-1)^2 + (-1)^2 = 1 + 1 + 1 + 1 = 4\).
   - By induction, if Ana can achieve \( N \) blocks each summing to \(\pm 1\), she can achieve \( N + 2 \) blocks by combining two blocks that sum to \(0\) into one block and adding two new blocks each summing to \(\pm 1\).

3. **Inductive Step:**
   - Assume Ana can achieve \( N \) blocks each summing to \(\pm 1\).
   - To achieve \( N + 2 \), find two consecutive blocks that sum to \(0\) and combine them into one block. Then add two new blocks each summing to \(\pm 1\).
   - This process ensures that Ana can achieve any even \( N \) from \(0\) to \(2016\).

4. **Conclusion:**
   - Ana can ensure victory for any even \( N \) from \(0\) to \(2016\).

The final answer is \( \boxed{ N } \) is any even number from \(0\) to \(2016\).