func_code_string: #include <bits/stdc++.h>   using namespace std;   int main() {     ios_base::sync_with_stdio(false);     cin.tie(0);     cout.tie(0);     int t;     cin >> t;     while (t--) {       string s;       int n, l = 0, r = 0, u = 0, d = 0;       cin >> s;       for (int i = 0; i < s.size(); i++) {         if (s[i] ==  L )           l++;         else if (s[i] ==  R )           r++;         else if (s[i] ==  U )           u++;         else           d++;       }       int a = min(l, r);       int b = min(u, d);       if (a == 0 && b == 0) {         cout << 0 << endl;       } else if (a == 0) {         cout << 2 << endl;         cout <<  UD  << endl;       } else if (b == 0) {         cout << 2 << endl;         cout <<  LR  << endl;       } else {         cout << 2 * (a + b) << endl;         for (int i = 0; i < a; i++) {           cout <<  L ;         }         for (int i = 0; i < b; i++) {           cout <<  U ;         }         for (int i = 0; i < a; i++) {           cout <<  R ;         }         for (int i = 0; i < b; i++) {           cout <<  D ;         }         cout << endl;       }     }     return 0;   }   