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;
main(){
	string str,str2;
	int tmp,tmp2;
	while(getline(cin,str)){
		for(int i=0;i<str.size();++i){
			str2="";
			tmp='t'-str[i];
			for(int j=0;j<4;++j){
				tmp2=str[i+j];
				if(tmp2>'e')tmp2-=26;
				tmp2+=tmp;
				if(tmp2>'z')tmp2-=26;
				else if (tmp2<'a')tmp2+=26;
				str2+=tmp2;
				if(str2=="the")break;
			}
			if(str2=="this" || str2=="that" || str2=="the"){
				break;
			}
		}
		str2="";
		for(int i=0;i<str.size();++i){
			tmp2=str[i];
			if(tmp2>='a' && tmp2<='z'){
				if(tmp2>'e')tmp2-=26;
				tmp2+=tmp;
				if(tmp2>'z')tmp2-=26;
				else if (tmp2<'a')tmp2+=26;
			}
			str2+=tmp2;
		}
		cout<<str2<<endl;
	}
}

C++: #include<iostream>
#include<string>
#include<algorithm>
#include<map>
#include<vector>
#include<cmath>
#include<cstdio>
#define loop(i,a,b) for(int i=a;i<b;i++) 
#define rep(i,a) loop(i,0,a)
#define pb(in,tmp) in.push_back(tmp)
#define all(in) in.begin(),in.end()
const double PI=acos(-1);
using namespace std;
int main(){
  string s;
  while(getline(cin,s)){
    while(s.find("this")==string::npos&&s.find("that")==string::npos&&s.find("the")==string::npos){
      rep(i,s.size()){
	if(s[i]=='z')s[i]='a';
	else if(isalpha(s[i]))s[i]++;
      }
    }
    cout<<s<<endl;


  }


}

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

using namespace std;

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

C++: #include <iostream>
#include <string>
#include <string.h>
#include <math.h>
#include <time.h>
#include <stdio.h>
#include <ctype.h>
#include <utility>
#include <algorithm>
#include <set>
#include <queue>
#include <stack>
#include <vector>
#include <map>
#include <list>
#include <sstream>
#include <iomanip>

using namespace std;

#define FORST(X,S,T) for(int X=(S); X<=(T); X++)  
#define RFORST(X,S,T) for(int X=(S); X>=(T); X--)  
#define FOR(X,XB) for(int X=0; X<(XB); X++)
#define RFOR(X,XB) for(int X=(XB)-1; X>=0; X--)
#define FORSTL(X,C) for(X=C.begin();X!=C.end();X++)
#define RFORSTL(X,C) for(X=C.rbegin();X!=C.rend();X++)
#define SQR(X) ((X)*(X))
#define MID(X,Y) (((X)+(Y))/2)
#define MIN(X,Y) (X=min((X),(Y)))
#define MAX(X,Y) (X=max((X),(Y)))
#define FILL(X,V) memset(X,V,sizeof(X))
#define FILE_R(X) freopen(X, "r", stdin)
#define FILE_W(X) freopen(X, "w", stdout)  
#define ERREQ(X,Y) (fabs((X)-(Y))<EPS)
#define DBGL cout << "here" << endl;
#define INITLISTS {L=0; FILL(adj,-1);}
#define SZ(X) (int)sizeof(X)
const double PI = acos(-1.0);
const double EPS = 1E-9;
const int INF = (int)1E9;
typedef long long LL;
typedef vector<int> VI;
typedef unsigned int uint;

#define MAXN 100005


int main(){
	string x, y;
	while(getline(cin, y)){
		FORST(k, 0, 25){
			
			x = y;
			FOR(i, x.length()){
				if(x[i]>='a' && x[i]<='z')
					x[i] = (k+x[i]-'a')%26+'a';
			}
			if(x.find("this")!=-1 || x.find("that")!=-1 || x.find("the")!=-1){
				cout << x << endl;
				break;
			}
		}
	}

	return 0;
}

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

string conv(string s, int d) {
  for(int i = 0; i < s.size(); ++i) {
    if(isalpha(s[i])) s[i] = (s[i]-'a'+d)%26+'a';
  }
  return s;
}

int main() {
  string s;
  while(getline(cin, s)) {
    for(int i = 0; i < 26; ++i) {
      string t = conv(s, i);
      if(t.find("the") != string::npos ||
	 t.find("this") != string::npos ||
	 t.find("that") != string::npos) {
	cout << t << endl;
	break;
      }
    }
  }
  return 0;
}

C++: #include <iostream>
#include <cstdio>
#include <vector>
#include <algorithm>
#include <regex>
#include <cctype>
#include <string>
using namespace std;

vector<string> v;

vector<string> split(string&& s, regex&& pattern) {
    sregex_token_iterator first(s.begin(), s.end(), pattern, -1);
    sregex_token_iterator last;
    return(vector<string>(first, last));
}

bool cheser() {
    for(int r = 1; r <= 26; r++) {
        bool found = false;
        for(int c = 0; c < v.size(); c++) {
            for(int k = 0; k < v[c].length(); k++) {
                if(!isalpha(v[c][k])) continue;
                int now = v[c][k] - 'a';
                now = (now+1)%26;
                v[c][k] = 'a' + now;
            }
            if(v[c] == "the" || v[c] == "this" || v[c] == "that") found = true;
        }
        if(found) return(true);
    }
    return(false);
}

int main(void) {
    string input;
    while(getline(cin, input)) {
        v = split(move(input), regex(" "));
        cheser();
        for(int r = 0; r < v.size(); r++) {
            cout << v[r];
            if(r == v.size() - 1) cout << endl;
            else                  cout << " ";
        }
    }
    
    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] != '.'){
						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] != '.'){
					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] << ' ';
		}
		cout << ans[count] << endl;

	}
	return 0;
}