大佬们看看呗

#include <bits/stdc++.h>
using namespace std;

int main() {
    string s1;
    vector<int>a;
    int t = 0;
    cin >> s1;
    
    for (int i = 0; i < s1.size(); i++) {
        if (s1[i] >= '0' && s1[i] <= '9') {
            a.push_back(s1[i] - '0');
            t++;
        }
    }
    
    sort(a.begin(),a.end(),less<int>());
    
    bool Zero = false;
    for (int i = t - 1; i >= 0; i--) {
        if (a[i] != 0) {
            Zero = true;
        }
        if (Zero || a[i] != 0) {
            cout << a[i];
        }
    }
    
    if (!Zero&& t > 0) {
        cout << "0";
    }
    
    
    return 0;
}