We need to implement the reverse process in order to solve this task, Suppose we have the array of new characters where each character is written as a number. For every sum[i] the real char in that spot will be sum[i]-sum[i-1] .We just need to loop over and recover the initial string, every s[i]=a[i]-a[i-1], and in the end s[0]=s[0]-5. Also, during this process we need to check for the subtraction not get lower than 0, in that case just add 26 to the negative result to turn it into positive.
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