What is the fine-grained topic of the following text: In Lithograph L is 12th, I is 9th, T is 20th, H is 8th, O is 15th, G is 7th, R is 18th, A is 1st, P is 16th letters in Alphabet Series. Only return the topic.
Position of letters in the Alphabet Series in the word 'Lithograph'.