Check If Digits Are Equal in String After Operations I

Description

You are given a string s consisting of digits. Perform the following operation repeatedly until the string has exactly two digits:

- For each pair of consecutive digits in s, starting from the first digit, calculate a new digit as the sum of the two digits modulo 10.

- Replace s with the sequence of newly calculated digits, maintaining the order in which they are computed.

Return true if the final two digits in s are the same; otherwise, return false.