https://pintia.cn/problem-sets/994805260223102976/problems/994805280074743808
#include <iostream>
using namespace std;
int main(){
string s, tmps = "PATest";
cin >> s;
int a[200] = {0}, sub = 0;
for(int i = 0; i < s.size(); i++)
a[s[i]]++;
for(int i = 0; i < 10002; i++){
if(a[tmps[sub]]){
cout << tmps[sub];
a[tmps[sub]]--;
}
sub++; sub %= 7;
}
return 0;
}