using namespace std;


int main()
{
    string plainAlphabet="abcdefghijklmnopqrstuvwxyz";
    string key;
    cout<<"the key is:"<<endl;
    cin>>key;
    string cipherAlphabet=key+plainAlphabet;
    string plainmsg;
    string ciphermsg;
    int changer;
    cout<<"Do you want to cipher or decipher?"<<endl;
    cin>>changer;
    cin.ignore();
    if(changer==1){
       cout<<"enter the plainmsg:"<<endl;
       getline(cin,plainmsg);
       for(int i=0;i<plainmsg.size();i++){
            for(int j=0;j<plainAlphabet.size();j++){
                    if(plainmsg[i]==plainAlphabet[j]){
                            plainmsg[i]=cipherAlphabet[j];
                            break;
                    }
            }
       }
       cout<<"ciphermsg is:"<<plainmsg<<endl;
    }
    else if(changer==2){
         cout<<"enter the ciphermsg"<<endl;
         getline(cin,ciphermsg);
         if(plainAlphabet.size()!=cipherAlphabet.size())
             return false;
         for(int y=0;y<ciphermsg.size();y++){
              for(int k=0;k<cipherAlphabet.size();k++){
                     if(ciphermsg[y]==cipherAlphabet[k]){
                            ciphermsg[y]=plainAlphabet[k];
                             break;
                     }
              }
         }
         cout<<"plainmsg is:"<<ciphermsg<<endl;
    }

   return 0;
}