CF1389C Good String

Let's call left cyclic shift of some string $ t_1 t_2 t_3 \dots t_{n - 1} t_n $ as string $ t_2 t_3 \dots t_{n - 1} t_n t_1 $ . Analogically, let's call right cyclic shift of string $ t $ as string $ t_n t_1 t_2 t_3 \dots t_{n - 1} $ . Let's say string $ t $ is good if its left cyclic shift is equal to its right cyclic shift. You are given string $ s $ which consists of digits 0–9. What is the minimum number of characters you need to erase from $ s $ to make it good?

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In the first test case, you can erase any $ 3 $ characters, for example, the $ 1 $ -st, the $ 3 $ -rd, and the $ 4 $ -th. You'll get string 51 and it is good. In the second test case, we can erase all characters except 0: the remaining string is 0000 and it's good. In the third test case, the given string $ s $ is already good.