You are given a series S of small English letters in length N. You are allowed (but not required) to select one index from this series and convert the letter in this index into another English character. The cost of this work is the sum of the ASCII price differences of the new character and the actual character; let's show it with an X. Next, consider the number of index pairs (i, j) in the resulting character unit (series after changing one character, or the original character unit if there is no altered character) so that 1si

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