int minimumKeypresses(string s) {
        unordered_map<char, int> counts;
        for (char ch : s) {
            counts[ch]++;
        }

        vector<int> frequencies;
        for (const auto& kvp : counts) {
            frequencies.push_back(kvp.second);
        }

        sort(frequencies.begin(), frequencies.end(), greater<int>());

        vector<int> remain {9, 9, 9};
        int i = 0, total = 0;
        for (int count : frequencies) {
            total += count * (i + 1);
            remain[i]--;
            if (remain[i] == 0) {
                i++;
            }
        }
       
        return total;
    }

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