Untitled

class Solution {
public:
    string clearDigits(string s) {
        string ans = "";
        for (char ch : s) {

            if (ch >= '0' && ch <= '9') {
                if (!ans.empty()) {
                    ans.pop_back();
                }
            } else
                ans.push_back(ch);
        }

        return ans;
    }
};