LC - 1309. Decrypt String from Alphabet to Integer Mapping

class Solution {
public:
    string freqAlphabets(string s) 
    {
        int x = ('2' - '0');
        cout << (char)('a' + x - 1);
        string res;
        int i = s.size() - 1;
        while(i >= 0) 
         {
            int l = 0;
            if(s[i] == '#') {
                --i;
                l += (s[i] - '0');
                --i;
                l += (s[i] - '0') * 10;
            } else {
                l = (s[i] - '0');
            }
            res.push_back('a' + l - 1);
            --i;
        }
        reverse(res.begin(), res.end());
        return res;
        
    }
};