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class Solution {

public:

string clearDigits(string s) {

int idx = 0;

for (int i = 0; i < s.size(); i++) {

if (isdigit(s[i])) {

idx--;

} else {

s[idx] = s[i];

idx++;

}

}

return s.substr(0, idx); // s[0:idx-1]

}

};