#include <bits/stdc++.h>
using namespace std;
bool f(char ch1,char ch2){
if(tolower(ch1)!=tolower(ch2)){
return tolower(ch1)<tolower(ch2);
}
return ch1<ch2;
}
int main() {
// your code goes here
string str;
cin>>str;
sort(str.begin(),str.end(),f);
cout<<str<<endl;
return 0;
}
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