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 <vector>
#include <queue>
#include <stack>
#include <map>
#include <set>
#include <cmath>
#include <cstdio>
#include <cstdlib>
#include <functional>
#include <string>
#include <algorithm>
#include <string>
#include <climits>
#include <iomanip>
#include <utility>

#define REP(i, n) for (int (i) = 0; (i) < (int)(n); (i)++)
#define REG(i, a, b) for (int (i) = ((int)(a)); (i) < ((int)(b)); i++)
#define ALL(V) (V).begin(), (V).end()
#define PRINT(STR) cout << (STR) << endl
#define DEBUG(X) cerr << X << " (" << __LINE__ << ", " << __func__ << " )" << endl;

typedef long long ll;
using namespace std;

int main() {
	cin.tie(0); //?????±?????????????????????
	ios::sync_with_stdio(false); //printf??¨??±??????????????????
	string str;
	while (getline(cin, str)) {
		for (int i = -26; i <= 26; i++) {
			string newstr = str;
			for (int j = 0; j < str.size(); j++) {
				if ('a' <= newstr[j] && newstr[j] <= 'z') {
					newstr[j] = str[j] + i;
					if (newstr[j] > 'z') {
						newstr[j] -= 'z';
						newstr[j] += 'a';
					}
				}
			}
			//cerr << newstr << endl;
			if (newstr.find("the", 0) != string::npos ||
					newstr.find("this", 0) != string::npos ||
					newstr.find("that", 0) != string::npos) {
				cout << newstr << endl;
				break;
			}
		}
	}
	return 0;
}

C++: #include<bits/stdc++.h>
using namespace std;

int main(int argc, char *argv[]){
  char c[26];
  for (int i = 0; i < 26; i++) {
    c[i] = 'a' + i;
  }
  vector<string> vs;
  string s;
  string ans[] = {"this", "that", "the"};
  vector<string> tmp;
  while(cin >> s)vs.push_back(s);
  vs[vs.size() - 1].substr(0, vs[vs.size() - 1].length() - 1);
  for (int k = 0; k < 26; k++) {
    tmp = vs;
    for (int i = 0; i < vs.size(); i++) {
      for (int j = 0; j < vs[i].length(); j++) {
        tmp[i][j] = c[(vs[i][j] - 'a' + k) % 25];
      }
    }
    for (int i = 0; i < 3; i++) {
      for (int j = 0; j < tmp.size(); j++) {
        if(tmp[j] == ans[i]){k = 50, i = 10, j = 1000;}
      }
    }
  }
  for (int i = 0; i < tmp.size(); i++) {
    std::cout << tmp[i];
    if(i == tmp.size() - 1)std::cout << "." << std::endl;
    else std::cout << " ";
  }
  return 0;
}

C++: #include<iostream>
#include<vector>
#include<algorithm>
#include<cctype>
#include<utility>
#include<string>
#include<cstdio>

#define REP(n) for(int i = 0;i < n;i++)
#define LLREP(n) for(long long int  i = 0;i < n;i++)
typedef long long int ll;
using namespace std;
#define MAX_A 1000000007

int main(){

    string s;
    int tmp = 0;
    while(getline(cin,s)){
        for(int i = 0;i < 26;i++){
            string tmp(s);
            for(int j = 0;j < s.length();j++){

                if(isalpha(s[j])){
                    tmp[j] = (s[j]-'a'+i)%26 + 'a';
                }
            }
               
            if(tmp.find("the")!=-1||tmp.find("this")!=-1||tmp.find("that")!=-1) {
                cout << tmp << endl;
                break;  
            }
        }
        
    }


    return 0;
}

C++: #include <functional>
#include <algorithm>
#include <iostream>
#include <numeric>
#include <iomanip>
#include <utility>
#include <cstdlib>
#include <sstream>
#include <bitset>
#include <vector>
#include <cstdio>
#include <ctime>
#include <queue>
#include <deque>
#include <cmath>
#include <stack>
#include <list>
#include <map>
#include <set>

using namespace std;

typedef vector<int> vi;
typedef pair<int,int> pii;
typedef long long ll;

#define dump(x)  cerr << #x << " = " << (x) << endl
#define rep(i,n) for(int i=0;i<(n);i++)
#define all(a)  (a).begin(),(a).end()
#define pb push_back


bool is(string s){
    int len=s.size();
    cout<<s<<endl;
    rep(i,len-3){
        if( s[i]=='t' && s[i+1]=='h' && s[i+2]=='i' && s[i+3]=='s' && ( (i==0 || s[i-1]==' ') && (i+4==len || s[i+4]==' ') ) ){
            return true;
        }
        if( s[i]=='t' && s[i+1]=='h' && s[i+2]=='a' && s[i+3]=='t' && ( (i==0 || s[i-1]==' ') && (i+4==len || s[i+4]==' ') ) ){
            return true;
        }
        if( s[i]=='t' && s[i+1]=='h' && s[i+2]=='e' && ( (i==0 || s[i-1]==' ') && (i+3==len || s[i+3]==' ') ) ){
            return true;
        }
    }
    
    return false;
}

int main() {
    string s;
    getline(cin,s);

    while(1){
        if(is(s))break;
        rep(i,s.size()){
            if(s[i]<='z' && s[i]>='a'){
                if(s[i]=='a')s[i]='z';
                else{
                    s[i]--;
                }
            }
        }
    }
    cout<<s<<endl;
    
    
    return 0;
}

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

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

C++: #include<stdio.h>
#include<iostream>
#include<math.h>
#include<algorithm>
#include<string>
#define pi 3.14159
using namespace std;

int main() {
	string str;
	int i;
	while(getline(cin, str)) {
		for(i = 0; i < 26; i++) {
			for(int j = 0; j < str.size(); j++) {
				if(str[j] != ' ' && str[j] != '.') {
					if(str[j] != 'a') {
						str[j] -= 1;
					} else str[j] = 'z';
					cout << str <<endl;
				}
			}
			for(int j = 0; j < str.size() - 4; j++) {
				if(str[j] == 't' && str[j + 1] == 'h') {
					if(str[j + 2] == 'e' || str[j + 2] == 'i' || str[j + 2] == 'a') {
						cout << str <<endl;
						i = 26;
						break;
					}
				}
			}
			
		}
	}

	return 0;
}

C++: #include <bits/stdc++.h>
 
using namespace std;
 
#define FOR(i, j, k) for(int i = j; i < k; ++i)
#define rep(i, j) FOR(i, 0, j)
#define repr(i, j) for(int i = j; i >= 0; --i)
#define INF (1 << 30)
#define MOD 1e9 + 7
 
typedef long long ll;
typedef unsigned long long ull;
typedef pair<int, int> P;
 
int main() {
    string s;
    while(getline(cin, s)){
    	rep(i, 26) {
	    	rep(j, s.size()) {
	            if('a' <= s[i] && s[i] <= 'z') s[j] = s[j] + 'a';
	            else s[j] = 'a';
	        }
	        if(s.find("the") != string::npos || s.find("this") != string::npos || s.find("that") != string::npos){
                cout << s << endl;
            }
	    }
    }
    return 0;
}