func_code_string: #include <bits/stdc++.h>   using namespace std;   string s;   int main() {     cin >> s;     int n = s.size();     bool flag = 1;     for (int i = 1; i < n; i++)       if (!(s[i] >=  A  && s[i] <=  Z )) flag = 0;     if (flag) {       for (int i = 0; i < n; i++)         if ( a  <= s[i] && s[i] <=  z )           cout << (char)(s[i] +  A  -  a );         else           cout << (char)(s[i] +  a  -  A );       cout << endl;     } else       cout << s << endl;     return 0;   }   