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 <bits/stdc++.h>
using namespace std;
#define FOR(i, s, n) for(int i = s; i < (int)n; i++)
#define per(i, n) for(int i = n; i >= 0; i--)
#define ROF(i, s, n) for(int i = s; i >= (int)n; i--)
#define FORIT(i, A) for (auto i : A)
#define PRINT(x) cout << (x) << "\n"
#define ALL(a) (a).begin(),(a).end()
#define RALL(a) (a).rbegin(), (a).rend()
#define MP make_pair
#define EACH(i, n) for (__typeof((n).begin()) i = (n).begin(); i != (n).end(); ++i)
#define SZ(a) int((a).size())
#define EXIST(s,e) ((s).find(e)!=(s).end())
#define SORT(c) sort((c).begin(),(c).end())
#define CLR(a) memset((a), 0 ,sizeof(a))
#define NCLR(a) memset((a), -1 ,sizeof(a))
#define dump(x) cout << #x << " = " << (x) << "\n";
#define debug(x) cout << #x << " = " << (x) << " (L" << __LINE__ << ")" << " " << __FILE__ << "\n";
#define sq(n) (n) * (n)
typedef vector<int> VI;
typedef vector<VI> VVI;
typedef vector<string> VS;
typedef pair<int, int> PII;
typedef long long LL;
typedef vector<LL> VLL;
typedef vector<VLL> VVLL;
typedef unsigned int uint;
typedef unsigned long long ull;
typedef priority_queue<int> maxpq;
typedef priority_queue< int, vector<int>, greater<int> > minpq;
typedef complex<double> P;
static const double EPS = 1e-10;
static const double PI = acos( -1.0 );
static const int mod = 1000000007;
static const int INF = 1 << 30;
static const LL LL_INF = 1152921504606846976;
static const int dx[] = { -1, 0, 1, 0, 1, -1, 1, -1 };
static const int dy[] = { 0, -1, 0, 1, 1, 1, -1, -1 };

string str;

int main() {
	getline( cin, str );
	for ( ;; ) {
		for ( int j = 0; j < str.size(); j++ ) {
			if ( str[ j ] >= 'a' && str[ j ] <= 'z' ) {
				str[ j ] = ( ( str[ j ] - 'a' + 25 ) % 26 ) + 'a';
			}
		}
		bool is_can = false;
		for ( int j = 0; j < str.size() - 2; j++ ) {
			if ( str.substr( j, 3 ) == "the" ) {
				is_can = true;
				break;
			}
		}
		for ( int j = 0; j < str.size() - 3; j++ ) {
			if ( str.substr( j, 4 ) == "that" || str.substr( j, 4 ) == "this" ) {
				is_can = true;
				break;
			}
		}
		if ( is_can ) {
			break;
		}

	}
	printf( "%s\n", str.c_str() );
	return 0;
}

C++: #include <iostream>
#include <cstring>
#include <stdio.h>

int find(const std::string &str){
	return (str.find("this",0)!=std::string::npos) + (str.find("that",0)!=std::string::npos) + (str.find("the",0)!=std::string::npos);
}

std::string rot(const std::string &prm, int n)
{
	std::string str=prm;

	for(int i=0; i < str.size(); i++){
		if(('a'<=str[i]) && (str[i]<='z'))
			str[i] = (str[i]+n > 'z')?(str[i]+n-'z'+'a'-1):(str[i]+n);
	}
return str;
}
	
int main(void)
{
	char s[81]="";
	while(std::cin.getline(s,sizeof(s)))
	{
		std::string in=s;
		for(int i=0;i < ('z'-'a');i++)
		{
			if(find(rot(in, i))){
				std::cout << rot(in, i) << std::endl;
				break;
			}
		}
	}
	return 0;
}

C++: #define scanf_s scanf
#define gets_s gets
#include <stdio.h>
#include <string>
#include <iostream>
#include <math.h>
using namespace std;
#define MAX 81
#define _MAX 100
#define ABC 26
int main(void)
{
	int n, s = 0, x, y, r = 0, d;
	char str[MAX];
	while (gets_s(str) != NULL) {
		for (int i = 0; str[i] != '\0'; ++i) {
			if (str[i] - 't' == str[i + 1] - 'h') {
				d = str[i] - 't';
				if ((str[i + 2] - 'a' - d + ABC) % ABC == 'e' - 'a') { break; }
				else if ((str[i + 2] - 'a' - d + ABC) % ABC == 'i' - 'a' && (str[i + 3] - 'a' - d + ABC) % ABC == 's' - 'a') { break; }
				else if ((str[i + 2] - 'a' - d + ABC) % ABC == 'a' - 'a' && (str[i + 3] - 'a' - d + ABC) % ABC == 't' - 'a') { break; }
			}
		}
		for (int i = 0; str[i] != '\0'; ++i) {
			if ('a' <= str[i] && str[i] <= 'z') {
				printf("%c", (str[i] - 'a' - d + ABC) % ABC + 'a');
			}
			else { printf("%c", str[i]); }
		}
		printf("\n");
	}
}

C++: #include<iostream>
#include<cstdio>
#include<cmath>
#include<vector>
#include<list>
#include<set>
#include<map>
#include<stack>
#include<queue>
#include<string>
#include<utility>
#include<algorithm>
#include<functional>
#include<deque>
#include<string.h>
#include<ctype.h>
#include<time.h>
#include<stdlib.h>
using namespace std;

char c[80], word[40][10];
int p = 0, q = 0;

bool search_th(){
  for (int i = 0; i <= p; i++){
    if (word[i][0] == 't' && word[i][1] == 'h'){
      if (word[i][2] == 'e' || (word[i][2] == 'i' && word[i][3] == 's') || (word[i][2] == 'a' && word[i][3] == 't')){
        return true;
      }
    }
  }
  return false;
}

void split_words(){
  for (int i = 0; i < 40; i++){
    for (int j = 0; j < 10; j++){
      word[i][j] = '\0';
    }
  }
  for (int i = 0; i < strlen(c); i++){
    if (c[i] >= 'a' && c[i] <= 'z'){
      word[p][q++] = c[i];
    } else {
      p++;
      word[p++][0] = c[i];
      q = 0;
    }
  }
  for (int i = 0; i <= p; i++){
    printf("word[%d]:%s\n", i, word[i]);
  }
}

int main(){
  while (cin.getline(c, sizeof(c))){
    p = 0;  q = 0;
    split_words();
    while (1){
      if (search_th() == true){
        for (int i = 0; i <= p; i++){
          cout << word[i];
        }
        puts("");  break;
      } else {
        for (int i = 0; i <= p; i++){
          for (int j = 0; j < strlen(word[i]); j++){
            if (word[i][j] >= 'a' && word[i][j] <= 'y'){
              word[i][j]++;
            } else if (word[i][j] == 'z'){
              word[i][j] = 'a';
            }
          }
        }
      }
    }
    for (int i = 0; i < 80; i++){
      c[i] = '\0';
    }
  }
  return 0;
}

C++: #include <cstdio>
#include <cstdlib>
#include <iostream>
#include <algorithm>
#include <cstring>
#include <string.h>
#include <queue>
#include <stack>
#include <utility>
#include <queue>
#define mp make_pair
#define pii pair<int,int> 
#define ff first
#define ss second

using namespace std;

char a[1000];
int b,c;

int main()
{
	while(fgets(a,999,stdin))
	{
		c=0;
		while(true)
		{
			if(strstr(a,"this")||strstr(a,"the")||strstr(a,"that"))break;
			for(b=0;b<strlen(a);b++)
			{
				if(islower(a[b]))
				a[b]++;
				if(a[b]>122)
				a[b]=97;
			}
			c++;
			if(c>27)
			break;
		}
		printf("%s",a);
	}
	return 0;
}

C++: #include <iostream>
#include <cstring>
#include <string>
using namespace std;
int main(){
	string str[81]; int diff; int i=0;int flag=0;
	while(cin >> str[i]){
	if(flag==0) diff='t'-str[i][0];
	if(flag==1) ;
	else if(str[i].size()==3 && str[i][1]+diff=='h' && str[i][2]+diff=='e') flag=1;
	else if(str[i].size()==4 && str[i][1]+diff=='h' && str[i][2]+diff=='i' && str[i][3]+diff=='s') flag=1;
	else if(str[i].size()==4 && str[i][1]+diff=='h' && str[i][2]+diff=='a' && str[i][3]+diff=='t') flag=1;
	i++;
	};
	for(int j=0;j<i;j++){
		if(j) cout << ' ' ;
		for(int k=0;k<str[j].size();k++){
			char ch=str[j][k]+diff;
			if(str[j][k]-'a'>=0 && str[j][k]-'z'<=0) cout << ch ;
			else cout << str[j][k] ;
		};
	};
	cout << '\n' ;
}