There are $2022$ grids in a row. Two people A and B play a game with these grids. At first, they mark each odd-numbered grid from the left with A's name, and each even-numbered grid from the left with B's name. Then, starting with the player A, they take turns performing the following action:

$\bullet$ One should select two grids marked with his/her own name, such that these two grids are not adjacent, and all grids between them are marked with the opponent's name. Then, change the name in all the grids between those two grids to one's own name. 

Two people take turns until one can not perform anymore. Find the largest positive integer $m$ satisfying the following condition: 

$\bullet$ No matter how B acts, A can always make sure that there are at least $m$ grids marked with A's name. 
1. **Generalization and Definition:**
   Let \( f(n) \) be the largest number of grids that A can guarantee to be marked with A's name for any even number \( n \). We need to prove that \( f(4n+2) = f(4n) = 2n+1 \).

2. **Base Cases:**
   - For \( n = 1 \):
     \[
     f(2) = 1
     \]
     This is because there are only two grids, one marked with A and one with B. A can guarantee at least one grid marked with A.
   - For \( n = 2 \):
     \[
     f(4) = 3
     \]
     This is because there are four grids, initially marked as ABAB. A can change the sequence to AAAB, ensuring at least three grids marked with A.

3. **Inductive Hypothesis:**
   Assume that the claim holds for \( 4k \) and \( 4k+2 \) for some \( k \). That is, \( f(4k) = 2k+1 \) and \( f(4k+2) = 2k+1 \).

4. **Inductive Step for \( 4n \):**
   - Consider \( 4n \) grids initially marked as \( ABAB \cdots AB \).
   - A can perform the operation to change the sequence to \( AAAB \cdots AB \).
   - After this step, the sequence becomes \( AAAB \cdots ABBBA \cdots AB \).
   - This reduces the problem to \( 4(n-1) + 2 \) grids, where B starts.
   - By the inductive hypothesis, \( f(4(n-1) + 2) = 2(n-1) + 1 \).
   - Therefore, \( f(4n) = 2 + f(4(n-1) + 2) = 2 + (2(n-1) + 1) = 2n + 1 \).

5. **Inductive Step for \( 4n+2 \):**
   - Consider \( 4n+2 \) grids initially marked as \( ABAB \cdots ABAB \).
   - A can perform the operation to change the sequence to \( AAAB \cdots AB \).
   - After this step, the sequence becomes \( AAAB \cdots ABBBA \cdots AB \).
   - This reduces the problem to \( 4(n-1) + 4 \) grids, where B starts.
   - By the inductive hypothesis, \( f(4(n-1) + 4) = 2(n-1) + 1 \).
   - Therefore, \( f(4n+2) = 2 + f(4(n-1) + 4) = 2 + (2(n-1) + 1) = 2n + 1 \).

6. **Conclusion:**
   By induction, we have shown that \( f(4n) = 2n+1 \) and \( f(4n+2) = 2n+1 \) for all \( n \).

7. **Application to the Problem:**
   - For \( n = 505 \):
     \[
     f(2022) = 2 \cdot 505 + 1 = 1011
     \]

The final answer is \(\boxed{1011}\)