s = input() cnt = 0 n = len(s) for i in range(n//2): d = abs(ord(s[i]) - ord(s[n-1-i])) cnt += min(d,26-d) print(cnt)
s = input() cnt = 0 n = len(s) for i in range(n//2): d = abs(ord(s[i]) - ord(s[n-1-i])) cnt += min(d,26-d) print(cnt)
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