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  1. #include <bits/stdc++.h>
  2. using namespace std;
  3.  
  4. #define ll long long
  5. #define ull unsigned long long
  6. #define ld long double
  7.  
  8. void Free_palestine() {
  9.     ios::sync_with_stdio(false);
  10.     cin.tie(NULL);
  11.     cout.tie(NULL);
  12. }
  13.  
  14. const int N = 2e5 + 5;
  15. const int MOD = 1e9 + 7;
  16. const int MAXN = 1e5 + 5;
  17.  
  18.  
  19. signed main(){
  20.   Free_palestine();
  21.   string st;
  22.   cin >> st;
  23.  
  24.     bool flag = 1;
  25.     for (int i = 1; i < st.size(); i++) {
  26.         if (islower(st[i])) {
  27.             flag = 0;
  28.             break;
  29.         }
  30.     }
  31.  
  32.  
  33.     if (flag) {
  34.         for (int i = 0; i < st.size(); i++) {
  35.             if (isupper(st[i])) {
  36.                 st[i] = tolower(st[i]);
  37.             } else {
  38.                 st[i] = toupper(st[i]);
  39.             }
  40.         }
  41.     }
  42.  
  43.     cout << st << "\n";
  44.     return 0;
  45. }
Success #stdin #stdout 0s 5324KB
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https://ideone.com/IPdqbR
language:
C++ (gcc 8.3)
created:
6 hours ago
visibility:
public

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