#include <bits/stdc++.h>
using namespace std;
bool compare(char c, char b) {
    return tolower(c) < tolower(b);  // 忽略大小写排序
}
int main() {
    string s;
    while (getline(cin, s)) {
        string c;
        for (char x : s) {
            if (isalpha(x)) c += x;
        }
        stable_sort(c.begin(), c.end(), compare);
        int j = 0;
        for (char x : s) {
            if (isalpha(x)) cout << c[j++];  // 替换字母
            else cout << x;  // 非字母直接输出
        }
        cout << endl;
    }
}