func_code_string: #include <bits/stdc++.h>   using namespace std;   string S;   struct State {     char p[2][13];   };   int dx[5] = {1, 0, -1, 0, 1}, dy[8] = {0, 1, 0, -1, 1};   bool OK = false;   int solve(State &E, int r1, int r2, int depth) {     if (OK == true) return 1;     if (depth == 27) {       for (int i = 0; i < 26; i++) {         cout << E.p[i / 13][i % 13];         if (i % 13 == 12) cout << endl;       }       OK = true;       return 1;     }     for (int i = 0; i < 5; i++) {       int cx = r1 + dx[i], cy = r2 + dy[i];       if (cx < 0 || cx >= 2 || cy < 0 || cy >= 13) continue;       if (E.p[cx][cy] !=  $  && E.p[cx][cy] != S[depth]) continue;       char F = E.p[cx][cy];       E.p[cx][cy] = S[depth];       solve(E, cx, cy, depth + 1);       E.p[cx][cy] = F;     }     return 0;   }   int main() {     cin >> S;     for (int i = 0; i < 2; i++) {       for (int j = 0; j < 13; j++) {         State Y;         for (int k = 0; k < 26; k++) Y.p[k / 13][k % 13] =  $ ;         Y.p[i][j] = S[0];         solve(Y, i, j, 1);       }     }     if (OK == false) cout <<  Impossible  << endl;     return 0;   }   