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void rdxx()
{
    string s;
    cin >> s;
    map<char, ll> mp;
    for (auto x : s)
        mp[x]++;
    long long n = mp.size();
    if (n == 1)
    {
        cout << -1;
        return;
    }
    if (n == 4 || n == 3)
        cout << 4;
    else
    {
        for (auto x : mp)
        {
            if (x.second == 3)
            {
                cout << 6;
                return;
            }
        }
        cout << 4;
    }
}

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