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- n = int(input())
- s = input()
- s = list(s)
- s_inverse = s[::-1]
- k = 0
- for i in range(n):
- s = s[1:] + s[:1]
- k += 1
- if s == s_inverse:
- break
- if k == n:
- print(-1)
- else:
- print(k)
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