convert string to super ascii, Basic Computer Science

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A string S is said to be "Super ASCII", if it contains the character frequency equal to their ascii values. String will contain only lower case alphabets (''''''''a''''''''-''''''''z'''''''') and the ascii values will starts from 1 (i.e ascii value of ''''''''a'''''''' is 1 and ''''''''z'''''''' is 26). Now given a string S, you can perform operations, namely, add, delete and replace of any character present in the string. Every operation will consists of following costs

add = 2 unit
replace = 1 unit
delete = 3 unit

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