Step 1: Understanding the Concept:
Partial reversal of the alphabet. Only letters from Q to Z are reversed.
Step 2: Key Formula or Approach:
Calculate the final index from the left: \( 13 + 6 = 19^{th} \).
Step 3: Detailed Explanation:
1. The alphabet from A to P (1 to 16) remains normal.
2. The last 10 letters (17 to 26: Q, R, S, T, U, V, W, X, Y, Z) are reversed to become Z, Y, X, W, V, U, T, S, R, Q.
3. Target position: 13th from left + 6 to the right = 19th from left.
4. The 19th position falls in the reversed zone (17-26).
5. Mapping: 17th is Z, 18th is Y, 19th is X.
Step 4: Final Answer:
The letter is X.