#include <library.h>

const string alph = "abcdefghijklmnopqrstuvwxyz ";
const string perm = "ktpembvwgcnqzaljhyfoxurdis ";

int find(int pos, char c, string str)
{ if (pos >= str.length())
    return -1;
  if (str[pos] == c)
    return pos;
  return find(pos + 1, c, str); }

int find(char c, string str)
/* returns position of c in str, counting from 0
   or -1 if charcater doesn't appear */
{ return find(0, c, str); }

void encrypt(int pos, string s)
{ if (pos >= s.length())
    cout << "\n";
  else
  { int p = find(s[pos], perm);
    if (p == -1)
      cout << "?";
    else
      cout << alph[p];
    encrypt(pos + 1, s); } }

void encrypt(string s)
{ encrypt(0, s); }

void main()
{ while (true)
  { const string line = read_line();
    encrypt(line); } }

void test_one()
{ cout << perm << "\n";
  while (true)
  { cout << "Enter character to find: ";
    const char c = read_char();
    const int p = find(c, perm);
    if (p == -1)
      cout << "'" << c << "' Not found\n";
    else
      cout << "'" << c << "' Position = " << p << "\n"; } }