#include <iostream>
#include <string>
using namespace std;
int main() {
string s;
int i,j,n;
cin >> s;
n=s.size();
for (i=0;i<n;i=i+1){
for (j=0;j<n-1;j=j+1){
if(s[j]>s[j+1]){
swap (s[j],s[j+1]);
}
}
}
i=0;
j=0;
while (s[i]=0){
i++;
j++;
}
cout << s[i+1];
while (j>0){
cout << 0;
j--;
}
while (i+1<=n){
cout << s[i];
i++;
}
return 0;
}
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