题解 | 小红的双生串

from sys import stdin, stdout

from collections import Counter

input = lambda: stdin.readline().strip()
print = lambda x: stdout.write(str(x)+"\n")
a = input()
n = len(a)
d1 = Counter(a[:n//2])
d2 = Counter(a[n//2:])
print(n-max(d1.values())-max(d2.values()))