func_code_string: #include <bits/stdc++.h>   using namespace std;   const double eps = 1e-8;   const int INF = (1 << 30) - 1;   long long Gcd(long long a, long long b) {     while (a > 0 && b > 0) {       if (a > b)         a %= b;       else         b %= a;     }     return a + b;   }   long long x, y;   int main() {     cin >> x >> y;     if (Gcd(x, y) != 1) {       printf( Impossible n );       return 0;     }     vector<char> ans;     while (x > 0 && y > 0) {       if (x > y) {         long long k = x / y;         x %= y;         if (x == 0) k--;         vector<char> g;         while (k) {           g.push_back(k % 10 +  0 );           k /= 10;         }         for (int i = g.size() - 1; i >= 0; --i) ans.push_back(g[i]);         ans.push_back( A );       } else {         long long k = y / x;         y %= x;         if (y == 0) k--;         vector<char> g;         while (k) {           g.push_back(k % 10 +  0 );           k /= 10;         }         for (int i = g.size() - 1; i >= 0; --i) ans.push_back(g[i]);         ans.push_back( B );       }     }     for (int i = 0; i < ans.size(); ++i) printf( %c , ans[i]);     puts(  );     return 0;   }   