There is a board with three rows and $2019$ columns. In the first row are written the numbers integers from $1$ to $2019$ inclusive, ordered from smallest to largest. In the second row, $Ana$ writes those same numbers but ordered at your choice. In each box in the third row write the difference between the two numbers already written in the same column (the largest minus the smallest). $Beto$ have to paint some numbers in the third row so that the sum of the numbers painted is equal to the sum of the numbers in that row that were left unpainted. Can $Ana$ complete the second row so that $Beto$ does not achieve his goal?
1. **Define the problem setup:**
   - We have a board with three rows and 2019 columns.
   - The first row contains integers from 1 to 2019 in ascending order.
   - The second row contains the same integers but in an arbitrary order chosen by Ana.
   - The third row contains the absolute differences between the corresponding elements of the first and second rows.

2. **Define the elements:**
   - Let the elements in the first row be \( x_i \) where \( x_i = i \) for \( i = 1, 2, \ldots, 2019 \).
   - Let the elements in the second row be \( y_i \) where \( y_i \) is a permutation of \( x_i \).
   - The elements in the third row are \( z_i = |x_i - y_i| \).

3. **Sum of the third row:**
   - The sum of the elements in the first row is \( \sum_{i=1}^{2019} x_i = \frac{2019 \cdot 2020}{2} = 2019 \cdot 1010 \).
   - The sum of the elements in the second row is also \( \sum_{i=1}^{2019} y_i = 2019 \cdot 1010 \) because \( y_i \) is a permutation of \( x_i \).
   - Therefore, the sum of the elements in the third row is \( \sum_{i=1}^{2019} z_i = \sum_{i=1}^{2019} |x_i - y_i| \).

4. **Beto's goal:**
   - Beto needs to paint some numbers in the third row such that the sum of the painted numbers equals the sum of the unpainted numbers.
   - This means that the sum of the third row must be even, as it needs to be split into two equal parts.

5. **Analyzing the sum of the third row:**
   - Since \( x_i \) and \( y_i \) are both permutations of the same set of numbers, the sum \( \sum_{i=1}^{2019} (x_i - y_i) = 0 \).
   - The sum of the absolute differences \( \sum_{i=1}^{2019} |x_i - y_i| \) is always even. This is because for any two numbers \( a \) and \( b \), \( |a - b| \) is even if \( a \) and \( b \) have the same parity (both even or both odd), and odd if they have different parities. Since the total number of terms is even (2019), the sum of the absolute differences will always be even.

6. **Conclusion:**
   - Since the sum of the third row is always even, Beto can always achieve his goal by painting half of the sum of the third row.

\[
\boxed{\text{Beto will always achieve his goal}}
\]