func_code_string: #include <bits/stdc++.h>   using namespace std;   long long x, y, val = 0, q[1000010];   char d[1000010];   void build(int now, int x, int y) {     if (x == y) return;     int mid = (x + y) / 2;     build(2 * now, x, mid);     build(2 * now, mid + 1, y);   }   int main() {     build(1, 1, 1000);     cin >> x >> y;     while (1) {       if (x == y && x > 1) {         cout <<  Impossible ;         return 0;       }       if (x == y && x == 1) {         for (int i = 1; i <= val; i++) {           cout << q[i] << d[i];         }         return 0;       }       if (x > y) {         long long k = (x - 1) / y;         x -= k * y;         q[++val] = k;         d[val] =  A ;         continue;       }       if (x < y) {         long long k = (y - 1) / x;         y -= k * x;         q[++val] = k;         d[val] =  B ;         continue;       }     }   }   