Go: package main

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

var scanner = bufio.NewScanner(os.Stdin)

func cipher(text string, direction int, int_shift int) string {
	shift, offset := rune(int_shift), rune(26)
	runes := []rune(text)
	for index, char := range runes {
		switch direction {
		case 1:
			if char >= 'a' && char <= 'z'-shift || char >= 'A' && char <= 'Z'-shift {
				char = char + shift
			} else if char > 'z'-shift && char <= 'z' || char > 'Z'-shift && char <= 'Z' {
				char = char + shift - offset
			}
		case -1:
			if char >= 'a'+shift && char <= 'z' || char >= 'A'+shift && char <= 'Z' {
				char = char - shift
			} else if char >= 'a' && char < 'a'+shift || char >= 'A' && char < 'A'+shift {
				char = char - shift + offset
			}
		}
		runes[index] = char
	}
	return string(runes)
}

func main() {
	for scanner.Scan() {
		infos := strings.Split(scanner.Text(), " ")
		plain := make([]string, len(infos))
		// fmt.Println(infos)
		Decryption:
			for i := 0; i < 26; i++ {
				for j := range infos {
					plain[j] = cipher(infos[j], 1, i)
				}
				for j := range plain {
					if plain[j] == "this" || plain[j] == "that" || plain[j] == "the" {
						break Decryption
					}
				}
			}
			fmt.Println(strings.Join(plain, " "))
	}
}

C++: #define _CRT_SECURE_NO_WARNINGS
#include <stdio.h>
#include <string.h>
#include <ctype.h>

#define GETSTR(p)       do{ fgets((p), sizeof(p), stdin); } while(0)
#define CHOMP(p)        do{ char *_q = (p) + strlen(p)-1; if(*_q == '\n') *_q = 0;            } while(0)

int main(void){
    char buf[100];
    GETSTR(buf);
    CHOMP(buf);
    int len = strlen(buf);

    const int nn = 'z' - 'a' + 1;

    while(1){
        for(int i = 0; i < len; i++){
            if(isalpha(buf[i])){
                buf[i] = 'a' + (buf[i] - 'a' + nn - 1) % nn;
            }
        }
        char buf2[100];
        sprintf(buf2, " %s ", buf);
        int l = strlen(buf2);
        for(int i = 0; i < l; i++){
            if(! isalpha(buf2[i])) buf2[i] = ' ';
        }
        if(strstr(buf2, " the ") != NULL) break;
        if(strstr(buf2, " this ") != NULL) break;
        if(strstr(buf2, " that ") != NULL) break;
    }
    puts(buf);

    return 0;
}

C++: #define _USE_MATH_DEFINES

#include <iostream>
#include <string>
#include <sstream>
#include <iomanip>
#include <cmath>
#include <algorithm>
#include <utility>
#include <vector>
#include <numeric>

using namespace std;

int caesar(string s)
{
	string s0 = "this";
	string s1 = "that";
	string s2 = "the";

	for (int i = 0; i <= 26; i++)
	{
		if (s == s0 || s == s1 || s == s2)
		{
			return i;
		}
		for (int j = 0; j < 4; j++)
		{
			s0.at(j) = s0.at(j)++;
			if (s0.at(j) > 'z')
			{
				s0.at(j) = 'a';
			}
			s1.at(j) = s1.at(j)++;
			if (s1.at(j) > 'z')
			{
				s1.at(j) = 'a';
			}
		}
		for (int j = 0; j < 3; j++)
		{
			s2.at(j) = s2.at(j)++;
			if (s2.at(j) > 'z')
			{
				s2.at(j) = 'a';
			}
		}
	}

	return -1;
}

int main()
{
	string str;
	for (; getline(cin, str);)
	{
		stringstream ss;
		ss << str;

		vector<string> w;
		string s;
		int c = -1;
		for (; ss >> s;)
		{
			w.push_back(s);
			
			if (c == -1)
			{
				c = caesar(s);
			}
		}

		for (int i = 0; i < w.size(); i++)
		{
			for (int j = 0; j < w.at(i).size(); j++)
			{
				if (w.at(i).at(j) != '.')
				{
					char sp = w.at(i).at(j) - c;
					if (sp < 'a')
					{
						int p = 'a' - sp - 1;
						w.at(i).at(j) = 'z' - p;
					}
					else
					{
						w.at(i).at(j) = sp;
					}
				}			
			}

			cout << w.at(i) << (i == w.size() - 1 ? "" : " ");
		}

		cout << endl;
	}
}

C++: #include<string.h>
#include<stdio.h>
using namespace std;

int main(){
  char a[100],b[100];
  for(int i;i<100;i++){
    a[i]='\0';
    b[i]='\0';
  }
  gets(a);
  int i=0;
  while(i<26){
    for(int j=0;!(a[j]=='\0');j++){
      if(0x61<=a[j]+i&&a[j]+i<=0x7A)
	b[j]+=i;
      else if(0x61<=a[j]&&a[j]<=0x7A){
	b[j]=a[j]-26+i;
      }
      else if(a[j]==' ')
	b[j]=' ';
      else if(a[j]=='.')
	b[j]='.';
      
    }
    if(strstr(b,"the")||strstr(b,"this")||strstr(b,"that"))
      break;
    i++;
  }
  for(int k=0;a[k]!='\0';k++)
    printf("%s",b[k]);
  printf("\n");
  return 0;
}

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

using namespace std;

int main(){
    string s;
    while(getline(cin, s) && s){
        for(int i = 0; i < s.size(); i++) s[i]++;
        if(strstr(s.c_str(), "the") || strstr(s.c_str(), "this") || strstr(s.c_str(), "that") ){
            cout << s;
            return 0;
        }
    }
    return 0;
}

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

int main(){

	string code;
	string word;
	bool found;

	while( getline(cin, code) ){
		found = false;

		for( int j=0;j<25;j++ ){


			for( int i=0;i<code.length();i++ ){
				if( code[i] >= 'a' && code[i] <= 'z' ){
					code[i] += 1;
					if(code[i]=='z'+1)code[i]='a';
				}
			}


			word = "";
			for( int i=0;i<code.length()+1;i++){
				if(code[i] >= 'a' && code[i] <= 'z' )
					word += code[i];
				else{
					if( word == "the" || word == "this" || word == "that" ){
						found = true;
					}
					word = "";
				}
				
			}
			if(found)break;
			
			
			
		
		}
		cout << code << endl;
	}
	return 0;

}

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

char shift(char in){
	if('a'<=in&&in<='y'){
		return in+1;
	}else if(in=='z'){
		return 'a';
	}else{
		return in;cout<<";";
	}	
}
int main(){
	char a[100];
	string data;
	while(cin.getline(a,100)){
	cout<<a<<endl;
		while(true){
			data=a;
			if(data.find("the")!=-1 || data.find("this")!=-1 || data.find("that")!=-1)
				break;
			for(int i=0;a[i]!='\0';i++){
				a[i]=shift(a[i]);
			}
//		cout<<a<<endl;
		}
		cout<<data<<endl;
	}
}

C++: //#define _USE_MATH_DEFINES
//#include <cmath>
#include <iostream>
//#include <stdio.h>
//#include <stdlib.h>
//#include <iomanip>
#include <vector>
#include <string>
//#include <algorithm>
//#include <functional>
//#include <time.h>
#include <sstream>

using namespace std;

bool isthe(string str){
	//?????????????????????????????? the this that?????¢??? ????????°ture

	int d1, d2, d3;

	d1 = (str[1] - str[0] + 26) % 26;

	if (d1 != 14){
		return false;
	}
	else{
		d2 = (str[2] - str[0] + 26) % 26;
		if (d2 != 11 && d2 != 15 && d2 != 7){
			return false;
		}
		else{
			if (d2 == 11 && str.size() == 3){
				return true;
			}
			else{
				d3 = (str[3] - str[0] + 26) % 26;
				if (d2 == 15 && d3 == 25) return true;
				if (d2 == 7 && d3 == 0) return true;
			}
		}
	}

	return false;

}


int main(){
	
	string s,sc, buf;
	stringstream ss;
	vector <string> as;
	int dif = 0;


	while (getline(cin, s)){
		dif = 0;
		buf = "";
		sc = "";
		ss.str("");
		ss.clear();

		sc += s;
		for (int i = 0; i < sc.size(); i++){
			if (sc[i] == '.')sc[i] = ' ';
		}
		ss << sc;

		while (ss >> buf){
			//the this that???????´¢
			if (buf.size() == 4){
				if (isthe(buf)){
					dif = (buf[0] - 't' + 26)%26;
					break;
				}
			}
			if (buf.size() == 3){
				if (isthe(buf)){
					dif = (buf[0] - 't' + 26) % 26;
					//break;
				}
			}
		}

		for (int i = 0; i < s.size(); i++){
			if (s[i] >= 'a' && s[i] <= 'z') {
				s[i] -= dif;
				if (s[i] < 'a') s[i] += 26;
				if (s[i] > 'z') s[i] -= 26;
			}
		}

		cout << s << endl;
	}


	return 0;
}