Alphabet-to-number word analogy: “a : one :: f : ?” — convert letter position to its English number word.

Introduction / Context:
Map letters to their positions (A=1, …), then express the position as an English number word.

Given Data / Assumptions:

• a → 1 → “one.”
• f → 6 → “six.”

Concept / Approach:
Maintain the same mapping rule for both pairs.

Final Answer:
Six