Go: package main

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

var scanner = bufio.NewScanner(os.Stdin)

func nextString() string {
	scanner.Scan()
	return scanner.Text()
}

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 {
		infos := strings.Split(nextString(), " ")
		plain := make([]string, len(infos))
		if reflect.DeepEqual(infos, []string{}) {
			break
		}
		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++: #include <cstdio>
#include <cstdlib>
#include <iostream>
#include <string>
#include <cmath>
#include <algorithm>
#include <vector>
#include <queue>
#include <stack>
#include <map>

using namespace std;
typedef long long ll;

int main(){
    int in;
    char S[1000];
    
    for(int i=0;;i++){
        
        in = getchar();
        
        if(in==EOF){
            S[i]='\0';
            break;
        }else{
            S[i]=(char)in;
        }
    }
    
    for(int k=0;;k++){
        
        bool f = false;
        
        for(int i=0;;i++){
            if('a'<=S[i] && S[i]<='y'){
                S[i]++;
            }else if(S[i]=='z'){
                S[i]='a';
            }
            
            if(i>=3){ // && !('a'<=S[i] && S[i]<='z')){
                if(S[i-3]=='t' && S[i-2]=='h' && S[i-1]=='e')
                    f=true;
            }
            if(i>=4){ // && !('a'<=S[i] && S[i]<='z')){
                if(S[i-4]=='t' && S[i-3]=='h')
                    if((S[i-2]=='i' && S[i-1]=='s') || (S[i-2]=='h' && S[i-1]=='t'))
                        f=true;
            }
            
            if(S[i]=='\0') break;
        }
        
        if(f) break;
    }
    
    for(int i=0;S[i]!='\0';i++)
        printf("%c",S[i]);
    
    return 0;
}

C++: #include<iostream>
#include<string>
#include<algorithm>
using namespace std;
int main() {
	string str, the = " the", dis = " this", that = " that";
	int zure, count = 0, i = 0;
	string judge = " ";
	bool bo = false;
	getline(cin, str);
	for (int k = 0; k < 26; k++) {
		for (int j = 0; j < str.size(); j++) {
			zure = str[i] - 't';
			if (str[j] != ' ') {
				judge += str[j] - zure;
			}
			if (str[j] == ' ' || j == str.size() - 1) {
				if (judge == " the" || judge == " this" || judge == " that") {
					bo = true;
					break;
				}
				else {
					i = j+1 ;
					judge = " ";
				}
			}
		}
		if (bo == true) {
			break;
		}
	}
	for (int i = 0; i < str.size(); i++) {
		if (str[i] >= 'a'+abs(zure) && str[i] <= 'z' - abs(zure)) {
			str[i] -= zure;
		}
		else if ((str[i]-abs(zure) < 'a' || str[i]+abs(zure) > 'z') && str[i]!=' ' && str[i]!='.') {
			if (str[i] + zure > 'z') {
				str[i] -= zure; 
			}
			else if (str[i] - zure > 'z') {
				str[i] -= 26 + zure;
			}
			else if (zure < 0) {
				str[i] -= zure;
			}
			else {
				str[i] += 26 - zure;
			}
		}
		cout << str[i];
	}
	cout << endl;
	return 0;
}

C++: 
#include<string>

using namespace std;


int main(){

  string s, strc;

  while(getline(cin,s)){

    for(int j=0;j<26;j++){
      

      if(s.find("the")!=string::npos ||s.find("this")!=string::npos||s.find("that")!=string::npos ){
	cout << s << endl;
      }
      for(int i=0;i<s.size();i++){//size()ツづ債閉カツ篠堋療アツづ個陳キツつウツづーツ陛板つキ
	
	if(s[i]=='z')s[i]='a';
	else if(s[i]>='a'&&s[i]<='z')s[i]++;
      }

    }

  }
  

  return 0;
}

C++: #include<iostream>
#include<cstdio>
#include<cstring>
using namespace std;
char a[53]="abcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyz";
int main(){
    char str[81];
    while(cin>>str[0]){
        for(int i=1;i<81;i++)str[i]=0;
        for(int i=1;i<80;i++){
            str[i]=getchar();
            if(str[i]==10){
                str[i]=0;
                break;
            }
        }
        int len=strlen(str);

        for(int i=0;i<26;i++){
            char cpy[81];
            strncpy(cpy,str,81);

            for(int j=0;j<len;j++){
                if(str[j]==' ' || str[j]=='.' || str[j]==10)continue;
                cpy[j]=a[cpy[j]-'a'+i];
            }
            bool f=false;
            for(int j=0;j<len-2;j++){
                if(!strncmp(cpy+j,"the",3))f=true;
                if(!strncmp(cpy+j,"this",4))f=true;
                if(!strncmp(cpy+j,"that",4))f=true;
            }
            if(f){
                cout<<cpy<<endl;
                break;
            }
        }
    }
    return 0;


}

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

const char *table = "abcdefghijklmnopqrstuvwxyz";

inline char shift(char c, int n)
{
    return table[(c - 'a' - n) % 26];
}

void shift(std::string &s, int n)
{
    for (unsigned i = 0; i < s.size(); ++i) {
        if (s[i] != ' ' && s[i] != '.') s[i] = shift(s[i], n);
    }
}

int search_number(const std::string &s)
{
    for (unsigned i = 0; i < s.size() - 3; ++i) {
        int n = s[i] - 't';
        if (shift(s[i + 1], n) == 'h') {
            if (shift(s[i + 2], n) == 'e'
                    || (i < s.size() - 3 && shift(s[i + 2], n) == 'i' && shift(s[i + 3], n) == 's')
                    || (i < s.size() - 3 && shift(s[i + 2], n) == 'a' && shift(s[i + 3], n) == 't'))
                return n;
        }
    }
    return s[s.size() - 3] - 't';
}

int main()
{
    std::string s;
    while (getline(std::cin, s)) {
        shift(s, search_number(s));
        std::cout << s << std::endl;
    }
}

C++: #include <iostream>
#include <stdio.h>
#include <string>
#include <math.h>
#include <algorithm>
#include <vector>

using namespace std;
int main(){
	string str1;
	int i, j, n = 0;
	while(getline(cin, str1)){
		bool change = false;
		for(i = 0;i < 26;i++){
			for(j = 0;j < str1.size();j++){
				if(str1[j] != ' ' && str1[j] != '.'){
					str1[j] -= 1;
				}
			}
			for(j = 0;j+3 < str1.size();j++){
				if(str1[j] == 't' && str1[j+1] == 'h'){
					if(str1[j+2] == 'e' || (str1[j+2] == 'i' && str1[j+3] == 's') || (str1[j+2] == 'a' && str1[j+3] == 't')){
						n = i + 1;
						change = true;
						break;
					}
				}
			}
			if(change) break;
		}	
		for(i = 0;i < str1.size();i++){
			cout << str1[i];
		}
		cout << endl;
	}


	return 0;
}

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

using namespace std;

const string LIST[3] = {"the", "this", "that"};

bool judge(string);

int main(void){
	for(string input; getline(cin, input); cout << input << endl){
		for(int i = 0; i < 25; i ++){
			if(judge(input)) break;
			for(int j = 0; j < input.length(); j ++){
				if('a' <= input[j] && input[j] <= 'z')
					input[j] = (input.at(j) != 'z') ? input.at(j) + 1: 'a';
			}
		}
	}

	return 0;
}

bool judge(string input){
	istringstream iss(input);
	do{
		string sub;
		iss >> sub;
		for(int i = 0; i < 3; i ++)
			if(sub == LIST[i]) return true;
	} while(iss);

	return false;
}