#include <string>
#include <iostream>

using namespace std;

const string alpha = "abcdefghijklmnopqrstuvwxyz ";
const string randa = "hurdmyboxkgavsejcpzwinltqf ";

int position(char c, string s)
{ for (int i = 0; i < s.length(); i += 1)
    if (s[i] == c)
      return i;
  return -1; }

char encrypt(char c)
{ int pos = position(c, alpha);
  if (pos == -1)
    return c;
  else
    return randa[pos]; }

char decrypt(char c)
{ int pos = position(c, randa);
  if (pos == -1)
    return c;
  else
    return alpha[pos]; }

void encrypt(string & word)
{ for (int i = 0; i < word.length(); i += 1)
    word[i] = encrypt(word[i]); }

void decrypt(string & word)
{ for (int i = 0; i < word.length(); i += 1)
    word[i] = decrypt(word[i]); }

int main()
{ while (true)
  { cout << "Type a word: ";
    string word;
    cin >> word;
    encrypt(word);
    cout << "Encrypted = " << word << "\n";
    decrypt(word);
    cout << "re-decrypted = " << word << "\n"; } }