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

int search_number(const std::string &s)
{
    const char *key = "this";
    std::string::size_type p = 0;
    while (true) {
        std::string::size_type sp = s.find(' ', p);
        if (sp == std::string::npos) break;
        if (sp - p == 4) {
            int n = s[p] - key[0];
            if (s[p + 1] - key[1] == n && s[p + 2] - key[2] == n && s[p + 3] - key[3] == n) return n;
        }
        else p = sp + 1;
    }
    return s[p] - key[0];
}

int main()
{
    std::string s;
    while (getline(std::cin, s)) {
        int n = search_number(s);
        for (unsigned i = 0; i < s.size(); ++i) {
            if (s[i] != ' ' && s[i] != ',' && s[i] != '.') {
                s[i] -= n;
                if (s[i] < 'a') s[i] += 26;
                if (s[i] > 'z') s[i] %= 26;
            }
        }
        std::cout << s << std::endl;
    }
}

C++: #include<cstdio>
#include<iostream>
#include<algorithm>
#include<string>
using namespace std;
int main(){
  string str;
  int str_size;
  while(getline( cin , str )){
    str_size = str.size();
    while(1){
      for(int i=0;i<str_size;i++){
	if(str[i] == 'z')str[i]='a';
	else if(str[i] != '.' && str[i] != ' ')str[i]++;
      }
      if(str.find( "the" ) != -1)break;
      if(str.find( "that" ) != -1)break;
      if(str.find( "this" ) != -1)break;
    }
    cout << str << endl;
  }
}

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

using namespace std;

int main() { 
  string input_str;

  int shift = 1;
  while (getline(cin, input_str)) {
    for (int shift = 1; shift < 26; shift++) {
      string output_str = "";
      for (int str_i = 0; str_i < input_str.size(); str_i++) {
        char part = input_str[str_i];
        if (part >= 'a' && part <= 'z')
          part = 'a' + (part - 'a' + shift) % 26;
        output_str += part;
      }
      if (output_str.find("the") != string::npos || output_str.find("this") != string::npos || output_str.find("that") != string::npos) {
        cout << output_str << endl;
        break;
      }
    }
  }

  return 0;
}

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

using namespace std;
int main(){
	string str,dammy;
	int s;
	while(getline(cin,str)){
		dammy=str;
		for(int i=1;i<27;i++){
			for(int j=0;j<str.size();j++)if(str[j]!=' '&&str[j]!='.')str[j]++;
			//cout<<str<<endl;
			for(int j=0;j<str.size();j++)if(str[j]>'z')str[j]='a';
			s=str.find("this");
			if(s!=string::npos)break;
			s=str.find("that");
			if(s!=string::npos)break;
			s=str.find("the");
			if(s!=string::npos)break;
		}
	cout<<str<<endl;
}
}

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

int main() {
    using namespace std;
    string str;
    getline(cin, str);
    regex pattern(".*(the|this|that).*");
    smatch sm;
    for (int c = 0; c < 'z' - 'a' + 1; ++c) {
        for (size_t i = 0; i < str.size(); ++i) {
            if ('a' <= str[i] && str[i] <= 'z') {
                if (str[i] == 'z') {
                    str[i] = 'a';
                } else {
                    str[i] += 1;
                }
            }
        }
        //if (regex_match(str, sm, pattern)) {
        if (str.find( "the" ) != string::npos || str.find( "this" ) != string::npos || str.find( "that" ) != string::npos) {
            cout << str << endl;
            return 0;
        }
    }
}

C++: #include <bits/stdc++.h>
#define FOR(i,a,b) for(int i=(a);i<(b);i++)
#define RFOR(i,a,b) for(int i=(b) - 1;i>=(a);i--)
#define REP(i,n) for(int i=0;i<(n);i++)
#define RREP(i,n) for(int i=n-1;i>=0;i--)

#define PB push_back
#define INF INT_MAX/3
#define ALL(a) (a).begin(),(a).end()
#define CLR(a) memset(a,0,sizeof(a))

typedef long long int ll;

using namespace std;

int main(){

    string s[] = {"the","this","that"};
    string in;
    while(true){
	getline(cin,in);
	if(cin.eof()) break;
	bool f = false;
	int d = 1;
	REP(i,30){

	    f = true;
	    REP(i,in.size()){
		if(in[i] == '.' || in[i] == ' ' || in[i] == '\n') continue;
		in[i]= (char)( 'a' + ( (int)(in[i] - 'a') + d) % 26);
	    }
	    vector<bool> flgs(3,false);
	    REP(j,3){
		if(in.substr(0,s[j].size()) == s[j] && in[s[j].size()] == ' ') flgs[j] = true;
	    }
	    for(int i=0;i<in.size();i++){
		if(in[i] == ' '){
		    REP(j,3){
			if(in.substr(i+1,s[j].size()) == s[j] && in[i + s[j].size() + 1] == ' ') flgs[j] = true;
		    }
		}
	    }
	    if(flgs[0] || flgs[1] || flgs[2]) break;
	}
	cout << in << endl;
    }

    return 0;
}

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

using namespace std;


int main(){

	string line;

	while(getline(cin, line)){

		string str[80], ans[80];
		int count = 0;
		int flag = 0;
		int slide;

		//???????????????
		/*
		string temp;
		for(int i=0 ; i<line.size()-1 ; i++){
			temp += line[i];
		}
		line = temp;
		*/
		

		//???????????????????????¨???????´?
		for(int i=0 ; i<line.size() ; i++){
			if(line[i] == ' '){
				count++;
			}else{
				str[count] += line[i];
				ans[count] = str[count];
			}
		}
		count++;


		for(int i=1 ; i<=26 ; i++){
			for(int j=0 ; j<count ; j++){
				for(int k=0 ; k<str[j].size() ; k++){
					if(str[j][k] >= 'a' && str[j][k] <= 'z'){
						str[j][k]++;
						if(str[j][k] > 'z'){
							str[j][k] = str[j][k] - 'z' + 'a' -1;
						}
					}
					if(str[j][k] == 'h' && str[j][k-1] == 't'){
						flag = 1;
						slide = i;
						break;
					}
				}

				/*
				if(str[j] == "this" || str[j] == "the" || str[j] == "that"
						|| str[j] == "this." || str[j] == "the." ||str[j] == "that."){
					flag = 1;
					slide = i;
					break;
				}
				*/
			}
			if(flag == 1)break;
		}

		for(int i=0 ; i<count ; i++){
			for(int j=0 ; j<ans[i].size() ; j++){
				if(ans[i][j] >= 'a' && ans[i][j] <= 'z'){
					if((ans[i][j] + slide) > 'z' ){
						ans[i][j] = ans[i][j] - 'z' + 'a' + slide -1;
					}else{
						ans[i][j] = ans[i][j] + slide ;
					}
				}
			}
		}

		for(int i=0 ; i<=count ; i++){
			cout << ans[i];
			if(i < count) cout << ' ';
		}
		cout << endl;

	}
	return 0;
}