This is the 14680th most frequent Russian word.
пересказу
A retelling or recounting.
Here, 'пересказа' is the genitive case form of the noun, referring to the act or result of summarizing or retelling.
Эта история слишком сложна для пересказа.
This story is too complex to retell.
'пересказу' is in the dative case and indicates the task or process of retelling.
Учитель дал задание по пересказу текста.
The teacher gave an assignment to retell the text.
The word 'пересказу' is in the dative case, showing what the action is directed towards: retelling.