func_code_string: #include <bits/stdc++.h>   using namespace std;   char a[1000010];   char b[1000010];   int main() {     cin >> a;     int ind = 0;     int ans = 0;     int n = strlen(a);     for (int i = 0; i < n; i++) {       if (a[i] ==  [  || a[i] ==  <  || a[i] ==  (  || a[i] ==  { ) {         b[ind] = a[i];         ind++;       } else {         ind--;         if (ind < 0) {           cout <<  Impossible ;           return 0;         }         if (b[ind] ==  [  && a[i] !=  ] ) {           ans++;         } else if (b[ind] ==  <  && a[i] !=  > )           ans++;         else if (b[ind] ==  {  && a[i] !=  } )           ans++;         else if (b[ind] ==  (  && a[i] !=  ) )           ans++;       }     }     if (ind > 0)       cout <<  Impossible ;     else       cout << ans;   }   