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girijamanoj / Pr0b13m_S01v1n9 Public

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Pr0b13m_S01v1n9

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DC_4.py

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7 lines (7 loc) · 89 Bytes

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Pr0b13m_S01v1n9

/

DC_4.py

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7 lines (7 loc) · 89 Bytes

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t=int(input())

p=input()

q=set(p)

if(len(p)>26):

print(-1)

else:

print(t-len(q))

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