func_code_string: #include <bits/stdc++.h>   using namespace std;   int mx1, my1, mx2, my2;   string in;   int main() {     ios::sync_with_stdio(0);     cin >> in;     mx1 = in[0] -  a  + 1;     my1 = in[1] -  0 ;     cin >> in;     mx2 = in[0] -  a  + 1;     my2 = in[1] -  0 ;     cout << max(abs(mx1 - mx2), abs(my1 - my2)) << endl;     while (1) {       if (mx1 == mx2 && my1 == my2) break;       if (mx1 > mx2) {         cout <<  L ;         mx1 -= 1;       } else if (mx1 < mx2) {         cout <<  R ;         mx1 += 1;       }       if (my1 < my2) {         cout <<  U ;         my1 += 1;       } else if (my1 > my2) {         cout <<  D ;         my1 -= 1;       }       cout << endl;     }     return 0;   }   