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class Solution {
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 public:
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  int numUniqueEmails(vector<string> &emails) {
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    unordered_set<string> st;
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    for (auto &e : emails) {
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      string clean_email = "";
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      for (auto &ch : e) {
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        if (ch == '+' || ch == '@') break;
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        if (ch == '.') continue;
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        clean_email += ch;
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      }
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      clean_email += e.substr(e.find('@'));
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      st.insert(clean_email);
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    }
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    return st.size();
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  }
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};
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