func_code_string: #include <bits/stdc++.h>   using namespace std;   int grid[201][201]{0};   int main() {     string s;     cin >> s;     int x = 100;     int y = 100;     grid[x][y] = true;     for (auto& it : s) {       switch (it) {         case  L :           x--;           break;         case  R :           x++;           break;         case  U :           y--;           break;         case  D :           y++;       }       if (grid[x][y] || (it !=  L  && grid[x + 1][y]) ||           (it !=  R  && grid[x - 1][y]) || (it !=  U  && grid[x][y + 1]) ||           (it !=  D  && grid[x][y - 1])) {         cout <<  BUG  << endl;         return 0;       }       grid[x][y] = true;     }     cout <<  OK  << endl;   }   