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;

int main(){
  string str;

  while(getline(cin,str)){
    int flg = 0;

    while(true){
      for(int i = 0 ; i < str.length() ; i++){
	string key1 = str.substr(i,3),key2 = str.substr(i,4);
	if(key1 == "the" || key2 == "that" || key2 == "this") flg = 1;
      }

      if(flg) break;
      else{
	for(int j = 0 ; j < str.length() ; j++){
	  if('a' <= str[j] && str[j] <= 'z'){
	    str[j] -= 'a' - 'A';
	    str[j] = (char)('A'+(str[j]-'A'+26+1)%26);
	    str[j] += 'a' - 'A';
	  }
	  else continue;
	}
      }
    }
    cout << str << endl;
  }

  return 0;
}

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

using namespace std;

string line;
int str_len;

bool is_finish() {
  for(int i=0; i<str_len-3; i++) {
    if(line[i] == 't') {
      if(line[i+1] == 'h') {
        if(line[i+2] == 'e') { return true; }
        else if(line[i+2] == 'i' && line[i+3] == 's') { return true; }
        else if(line[i+2] == 'a' && line[i+3] == 't') { return true; }
      }
    }
  }
  return false;
};


int main() {
  while(getline(cin, line)) {
    str_len = line.length();

    for(int j=0; j<26; j++) {
      if(is_finish()) { 
        cout << line << endl;
        break; 
      }

      for(int j=0; j<str_len; j++) {
        if('a' <= line[j] && line[j] < 'z') {
          line[j] += 1;
        }
        else if(line[j] == 'z') {
          line[j] = 'a';
        }
      }
    }
  }
  return 0;
}

C++: #include <stdio.h>
#include <string.h>

int main(void){
    char buf[128];
    bool found;
    
    gets(buf);
    for(int i=0; i<26; i++){
        found = false;
        if (strstr(buf, "th")){
            found = (strstr(buf,"the") != NULL);
            found |= (strstr(buf,"this") != NULL);
            found |= (strstr(buf,"that") != NULL);
        }
        if (found) break;
        for (char *p = buf; *p != '\0'; p++){
            if (*p >= 'a' && *p <= 'z'){
                *p = (*p - 'a' + 1) % 26 + 'a';
            }
        }
    }
    printf("%s",buf);
    
    return 0;
}

C++: #include <iostream>
#include <complex>
#include <cmath>
#include <cstdio>
#include <string>
#include <sstream>

using namespace std;

string rotate(string str) {
    for (int i = 0; i < str.size(); i++) {
        if ('a' <= str[i] && str[i] < 'z')str[i]++;
        if (str[i] == 'z')str[i] = 'a';
    }
    return str;
}

int main() {
    string str;
    while(getline(cin, str)) {
        for (int i = 0; i < 26; i++) {
            str = rotate(str);
            string tmp;
            bool flg = false;
            for (int i = 0; i < str.size(); i++) {
                if (str[i] != '.')tmp += str[i];
            }
            stringstream ss(tmp);
            while(ss >> tmp) {
                if (tmp == "the" || tmp == "this" || tmp == "that")flg = true;
                break;
            }
            if (flg) {
                cout << str << endl;
                break;
            }
            if (i == 25)return 1;
        }
    }
    return 0;
}

C++: #include <iostream>
#include <sstream>
#include <iomanip>
#include <algorithm>
#include <cmath>
#include <string>
#include <vector>
#include <list>
#include <queue>
#include <stack>
#include <set>
#include <map>
#include <bitset>
#include <numeric>
#include <climits>
#include <cfloat>
using namespace std;

string solve(string s)
{
    int n = s.size();
    for(;;){
        for(int i=0; i<n; ++i){
            if('a' <= s[i] && s[i] <= 'z'){
                if(s[i] == 'z')
                    s[i] = 'a';
                else
                    ++ s[i];
            }
        }
        istringstream iss(s);
        string s1;
        while(iss >> s1){
            if(s1 == "the" || s1 == "this" || s1 == "that")
                return s;
        }
    }
}

int main()
{
    for(;;){
        string s;
        getline(cin, s);
        if(s == "")
            return 0;

        cout << solve(s) << endl;
    }
}

C++: #include <iostream>
#include <complex>
#include <cmath>
#include <cstdio>
#include <string>
#include <sstream>

using namespace std;

string rotate(string str) {
    for (int i = 0; i < str.size(); i++) {
        if ('a' <= str[i] && str[i] < 'z')str[i]++;
        if (str[i] == 'z')str[i] = 'a';
    }
    return str;
}

int main() {
    string str;
    while(getline(cin, str)) {
        for (int i = 0; i < 26; i++) {
            str = rotate(str);
            string tmp;
            bool flg = false;
            for (int i = 0; i < str.size(); i++) {
                if (str[i] != '.')tmp += str[i];
            }
            stringstream ss(tmp);
            while(ss >> tmp) {
                if (tmp == "the" || tmp == "this" || tmp == "that")flg = true;
                break;
            }
            if (flg) {
                cout << str << endl;
                break;
            }
        }
    }
    return 0;
}

C++: #include <stdio.h>
#include<iostream>
#include<cstdio>
#include<cstring>
#include<string.h>
using namespace std;
int main(void)
{
	int n, m, A = 0, B = 0, l, a[100] = { 0 }, b[100] = { 0 }, i = 0, j;
	char str[100] = { "ABCDEFGHIJKLMNOPQRSTUVWXYZABCDEFGHIJKLMNOPQRSTUVWXYZ"}, XML[1001] = { NULL }, poj[1001] = { NULL };
	scanf("%s", XML);
	for (i = 0; i < strlen(XML); i++) {
		for (n = 0; n < 26; n++) {
			if (XML[i] == str[n]) {
				poj[i] = str[n + 23];
			}
		}
	}
	

		printf("%s\n", poj);
}

C++: #include<iostream>
#include<string>
#include<cstdio>
using namespace std;
int main() {
	string a="";
	while (getline(cin, a)) {
		string b;
		int z=0,sum=0;
		for (int i = 0; i < a.length(); i++) {
			if (a[i] == ' ' || a[i] == '.' || a[i] == ',') {
				b = a.substr(z, i-z);
				int t = (int)'t';
				string c = "";				
				if (b.length() == 3 || b.length() == 4) {
					c = "";
					int w = t - (int)b[0];
					for (int i = 0; i < b.length(); i++) {
						int d = (char)((int)b[i] + w);
						if (d > 'z')
							d -= 26;
						else if (d < 'a')
							d += 26;
						c += (char)d;
					}
					if (c == "the" || c == "that" || c == "this") {
						sum = w;
						break;
					}
				}
				z = i + 1;
			}
		}
		string f = "";
		for (int i = 0; i < a.length(); i++) {
			if (a[i] != ' ' && a[i] != '.' && a[i] != ',') {
				int g = (int)a[i] + sum;
				if (g > (int)'z')
					g -= 26;
				else if (g < (int)'a')
					g += 26;
				f += (char)g;
			}
			else {
				f += a[i];
			}
		}
		cout << f << endl;
		int h=0;
		cin >> h >> h;
	}
}