func_code_string: #include <bits/stdc++.h>   using namespace std;   const int N = 200100;   const int M = 1000100;   const long long mod = 998244353;   int main() {     ios::sync_with_stdio(false);     int q;     cin >> q;     while (q--) {       string s;       cin >> s;       int l = 0, r = 0, u = 0, d = 0;       for (int i = 0; i < s.length(); i++) {         if (s[i] ==  L ) l++;         if (s[i] ==  R ) r++;         if (s[i] ==  U ) u++;         if (s[i] ==  D ) d++;       }       int ss = 0;       int minl = min(l, r);       int okl = 0, oku = 0;       if (minl != 0) {         okl = 1;       }       ss += minl;       int minu = min(u, d);       if (minu != 0) {         oku = 1;       }       ss += minu;       if (okl && oku) {         cout << ss * 2 << endl;         for (int i = 1; i <= minl; i++) {           cout <<  L ;         }         for (int i = 1; i <= minu; i++) {           cout <<  U ;         }         for (int i = 1; i <= minl; i++) {           cout <<  R ;         }         for (int i = 1; i <= minu; i++) {           cout <<  D ;         }         cout << endl;       } else if (okl && !oku) {         cout << 2 << endl;         cout <<  LR  << endl;       } else if (!okl && oku) {         cout << 2 << endl;         cout <<  UD  << endl;       } else {         cout << 0 << endl;       }     }     return 0;   }   