Go: package main

import (
	"bufio"
	"fmt"
	"os"
	"strings"
)

var scanner = bufio.NewScanner(os.Stdin)

func main() {
	for scanner.Scan() {
		var result string
		line := scanner.Text()
		key := make(map[string]string)

		var i int32
		for ; i < 52; i++ {
			makeKey(key, i)
			result = decode(key, line)

			if strings.Contains(result, "the") {
				break
			} else if strings.Contains(result, "this") {
				break
			} else if strings.Contains(result, "that") {
				break
			}
		}

		fmt.Println(result)
	}
}

func makeKey(key map[string]string, shift int32) {
	for i := 'a'; i <= 'z'; i++ {
		cipher := (i + shift)
		if cipher > 'z' {
			cipher = cipher%'z' + 'a' - 1
		} else if cipher < 'a' {
			cipher = cipher + ('z' - 'a') + 1
		}
		key[string(i)] = string(cipher)
	}
}

func decode(key map[string]string, cipher string) string {
	var result string
	for _, v := range cipher {
		if key[string(v)] != "" {
			result += key[string(v)]
		} else {
			result += string(v)
		}
	}
	return result
}

C++: #include <iostream>
#include <string>
using namespace std;

bool find(string str, string can) {
  string tmp_can = ' ' + can + ' ';
  string tmp_str = ' ' + str + ' ';
  for (int i = 0; i < tmp_str.length(); ++i) {
    if (string::npos != tmp_str.find(tmp_can, i)) {
      return true;
    }
  }
  return false;
}

int main() {
  string str;
  string candies[] = {"this", "the", "that"};
  while(getline(cin, str)) {
  for (int m = 0; m < 25; ++m) {
    for (int i = 0; i < str.length(); ++i) {
      if (str[i] == ' ') {
        continue;
      }
      if (str[i] == ',' || str[i] == '.') {
        str[i] = ' ';
        continue;
      }
      int char_id = static_cast<int>(str[i]) - 97;
      int shifted = static_cast<int>(char_id + 1);
      str[i] = static_cast<char>(shifted % 26 + 97);
    }
    for (int i = 0; i < sizeof(candies) / sizeof(candies[0]); ++i) {
      if (find(str, candies[i])) {
        cout << str << endl;
        break;
      }
    }
  }
  }
  return 0;
}

C++: #include <cstdio>
#include <cstdlib>
#include <cmath>
#include <map>
#include <utility>
#include <set>
#include <iostream>
#include <string>
#include <vector>
#include <algorithm>
#include <sstream>
#include <queue>
#include <cstring>
#include <functional>

using namespace std;

#define REP(i,a,b) for((i)=(a);(i)<(int)(b);(i)++)
#define rep(i,n) REP(i,0,n)
// BEGIN CUT HERE
#define foreach(itr,c) for(typeof((c).begin()) itr=(c).begin();itr!=(c).end();itr++)
template<class T> inline string toString(T x){ostringstream sout;sout<<x;return sout.str();}
// END CUT HERE

int main(){
  int i, j;
  string str;

  while(getline(cin,str)){
    int N = str.size();

    while(1){
      rep(i,N) if(str[i] != '.' && str[i] != ' ') str[i]--;
      rep(i,N) REP(j,i,N){
        if(str.substr(i,j) == "this" || str.substr(i,j) == "the" || str.substr(i,j) == "that"){
          cout << str << endl;
          return 0;
        }
      }
    }
  }

  return 0;
}

C++: #include <iostream>
#include <complex>
#include <cmath>
#include <cstdio>
#include <string>
#include <sstream>

using namespace std;

string rotate(string str) {
    for (int i = 0; i < str.size(); i++) {
        if ('a' <= str[i] && str[i] < 'z')str[i]++;
        else if (str[i] == 'z')str[i] = 'a';
    }
    return str;
}

int main() {
    string str;
    while(getline(cin, str)) {
        for (int i = 0; i < 26; i++) {
            str = rotate(str);
            string tmp;
            bool flg = false;
            for (int i = 0; i < str.size(); i++) {
                if (str[i] != '.')tmp += str[i];
            }
            stringstream ss(tmp);
            while(ss >> tmp) {
                if (tmp == "the" || tmp == "this" || tmp == "that")flg = true;
                break;
            }
            if (flg) {
                cout << str << endl;
                break;
            }
            if (i == 25)return 1;
        }
    }
    return 0;
}
#include <iostream>
#include <complex>
#include <cmath>
#include <cstdio>
#include <string>
#include <sstream>

using namespace std;

string rotate(string str) {
    for (int i = 0; i < str.size(); i++) {
        if ('a' <= str[i] && str[i] < 'z')str[i]++;
        else if (str[i] == 'z')str[i] = 'a';
    }
    return str;
}

int main() {
    string str;
    while(getline(cin, str)) {
        for (int i = 0; i < 26; i++) {
            str = rotate(str);
            string tmp;
            bool flg = false;
            for (int i = 0; i < str.size(); i++) {
                if (str[i] != '.')tmp += str[i];
            }
            stringstream ss(tmp);
            while(ss >> tmp) {
                if (tmp == "the" || tmp == "this" || tmp == "that")flg = true;
                break;
            }
            if (flg) {
                cout << str << endl;
                break;
            }
        }
    }
    return 0;
}

C++: /*0017 written by iPhone*/
#include <iostream>
#include <string>

using namespace std;

int main(){
    string s;
    while(getline(cin, s) && s != "\0"){
        for(int i = 0; i < s.size(); i++) {
            if(s[i] != ' ') s[i]++;
            if(s[i] > 'z' && s[i] != ' ') s[i] -= 26;
        }
        if(s.find("the") != -1 || s.find("this") != -1 || s.find("that") != -1 ){
            cout << s;
            return 0;
        }
    }
    return 0;
}

C++: #include<iostream>
#include<string>
#include<sstream>
#include<vector>


std::vector<std::string> split(const std::string &s, char delim) {
	std::vector<std::string> elems;
	std::stringstream ss(s);
	std::string item;
	while (std::getline(ss, item, delim)) {
		if (!item.empty()) {
			elems.push_back(item);
		}
	}
	return elems;
}

int main() {
	std::string input;
	while (std::getline(std::cin, input)) {
		std::vector<std::string> words;
		bool isPeriod = false, isCipher = false;
		if (*(input.rbegin()) == '.') {
			input.erase(input.end() - 1);
			isPeriod = true;
		}
		words = split(input, ' ');
		for (int i = 0; i < 26; i++) {
			for (std::vector<std::string>::iterator itr = words.begin(); itr != words.end(); itr++) {
				for (std::string::iterator sitr = (*itr).begin(); sitr != (*itr).end(); sitr++) {
					*sitr = ((*sitr - 'a' + 1) % 26) + 'a';
				}
				if (*itr == "the" || *itr == "this" || *itr == "that") {
					isCipher = true;
				}
			}
			if (isCipher) break;
		}
		std::string output = "";
		for (std::vector<std::string>::iterator itr = words.begin(); itr != words.end(); itr++) {
			if (output != "") output += " ";
			output += *itr;
		}
		if (isPeriod) output += ".";
		std::cout << output << std::endl;
	}
	return 0;
}

C++: #include<cstdio>
#include<cstdlib>
#include<cstring>
#include<cmath>
#include<cassert>
#include<iostream>
#include<sstream>
#include<string>
#include<vector>
#include<queue>
#include<set>
#include<map>
#include<utility>
#include<numeric>
#include<algorithm>
#include<bitset>
#include<complex>

using namespace std;

typedef long long Int;
typedef vector<int> vint;
typedef pair<int,int> pint;
#define mp make_pair

template<class T> void pv(T a, T b) { for (T i = a; i != b; ++i) cout << *i << " "; cout << endl; }
template<class T> void chmin(T &t, T f) { if (t > f) t = f; }
template<class T> void chmax(T &t, T f) { if (t < f) t = f; }
int in() { int x; scanf("%d", &x); return x; }

int main() {
	string str;
	for(;getline(cin,str)&eofbit;){
		int len=str.size();
		int i,c;
		for(c=1;c<=26;c++){
			for(i=0;i<len;i++){
				if('a'<=str[i]&&str[i]<='z'){
					str[i]++;
					if(str[i]>'z')str[i]='a';
				}
			}
			//cout<<str<<endl;
			if(str.find("the")!=string::npos||str.find("this")!=string::npos||str.find("that")!=string::npos){
				cout<<str<<endl;
				break;
			}
		}
	}
	return 0;
}