Go: package main

import (
	"bufio"
	"os"
	"strings"
	"fmt"
)

var scanner = bufio.NewScanner(os.Stdin)

func nextString() string {
	scanner.Scan()
	return scanner.Text()
}

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 {
		infos := strings.Split(nextString(), " ")
		plain := make([]string, len(infos))
		if len(infos) == 0 {
			break
		}
		// 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>
#include <time.h>
using namespace std;

int main(){
  int index ,flag=0 ,temp= 'z' - '`';
  string s ,key[3]={ "the" ,"this" ,"that" };

  while( true ){
    flag = 0;
    getline( cin ,s );
    if( cin.eof() ){
      break;
    }

    while( true ){
      for( int i=0 ; i<s.length() ; i++ ){ // シーザー暗号を戻す
	if( s[i] != '.' && s[i] != ' ' && s[i] != '\n' ){ //　記号はスルー
	  s[i]--;
	  if( s[i] < 'a' ){ // aからzに飛ばす
	    s[i] += temp; 
	  }
	}
      }
      
      for( int i=0 ; i<3 ; i++ ){
	index = s.find( key[i] ,0 ); // the ,this ,that を探す
	if( index != string::npos ){ // あった場合
	  cout << s << endl;
	  flag = 1;
	  cin.ignore();
	  break;
	}
      }
      if( flag == 1 ){
	break;
      }
    }
  }
}

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

int main(){
  string s;
  while(1){
    getline(cin,s);
    if(cin.eof()) break;
    for(int i=0;i<25;i++){
      if((s.find("this")!=string::npos) || (s.find("that")!=string::npos) || (s.find("the")!=string::npos)) break;
      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';
      }
    }
    cout << s << endl;
  }
}

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

string arrs[200];

bool judge4(const string &str) {
	int d1 = str[0] - 't';
	int d2 = str[1] - 'h';
	int d3 = str[2] - 'i';
	int d4 = str[3] - 's';
	int d5 = str[2] - 'a';
	int d6 = str[3] - 't';
	return (d1 == d2 && ((d2 == d3 && d3 == d4) || (d2 == d5 && d3 == d6)));
}

bool judge3(const string &str) {
	int d1 = str[0] - 't';
	int d2 = str[1] - 'h';
	int d3 = str[2] - 'e';
	return (d1 == d2 && d2 == d3);
}

int main() {
	cin.clear();
	int cnt = 0;
	while (!cin.eof()) {
		cin >> arrs[cnt++];
		char ch = getchar();
		if (ch == '\n') {
			bool isOk = 0;
			int delta = 0;
			for (int i = 0; i < cnt; ++i) {
				if (arrs[i].length() == 4) {
					if (judge4(arrs[i])) {
						isOk = 1;
						delta = arrs[i][0] - 't';
						break;
					}
				}else if (arrs[i].length() == 3) {
					if (judge3(arrs[i])) {
						isOk = 1;
						delta = arrs[i][0] - 't';
						break;
					}
				}
			}
			for (int i = 0; i < cnt; ++i) {
				for (int j = 0; j < arrs[i].length(); ++j) 
					if (arrs[i][j] != '.') arrs[i][j]-= delta;
				cout << arrs[i] << ((i == cnt - 1) ? "\n" : " ");
			}
			cnt = 0;
		}
	}
	return 0;
}

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

int main() {
	string sa;
	while (getline(cin, sa)&& sa != "END OF INPUT") {
		int a = sa.size();
		while (1) {
			for (int i = 0; i < a; i++) {
				if (sa[i] >='a' && sa[i] <='z') {
					sa[i] += 1;
				}
					if (sa[i]<'z'){
						sa[i] -= 26;
					}				
			}
			size_t za=sa.find(" this "||" that "||" the ");
			if (za != string::npos) {break;}
		}
		cout << sa << 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[] = {"this","the","that"};
    vector<string> in;
    while(true){
	string temp;
	cin >> temp;
	if(cin.eof()) break;
	in.PB(temp);

    }
    bool f = false;
    int d = 1;
    REP(i,30){

	f = true;
	REP(i,in.size()) REP(j,in[i].size()){
	    if(in[i][j] == '.') continue;
	    in[i][j] = (char)( 'a' + ( (int)(in[i][j] - 'a') + d) % 28);
	}
	vector<bool> flgs(3,false);
	for(int i=0;i<in.size();i++){
	    REP(j,3){
		bool flg = true;
		REP(k,s[j].size()) if(s[j][k] != in[i][k]) flg = false;
		if(flg)
		    flgs[j] = true;
	    }
	}
	REP(i,3) if( !flgs[i]) f = false;
	if(f) break;
    }
    REP(i,in.size()-1) cout << in[i] << " ";
    cout << in[in.size()-1] <<  endl;

    return 0;
}

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

char ans[200][82];
int main(){
	char str[82];
	int cor = 0;
	while(gets(str) != NULL){	//改行は読まない。はず!??
		int len;
		//char tran;
		len = strlen(str);
		//tran = 0;
		while(strstr(str,"this") == NULL && strstr(str,"that") == NULL && strstr(str,"the") == NULL){ 
			//tran++;
			for(int i = 0;i < len;i++){
				if(str[i] == 'z'){
					str[i] = 'a';
					continue;
				}
				if(str[i] == ' ' || str[i] == '.')
					continue;
				//str[i] = str[i]+tran;
				str[i]++;
			}
			//printf("%s\n",str);
		}
		strcpy(ans[cor],str);
		cor++;
	}
	for(int i = 0;i < cor;i++){
		printf("%s\n",ans[i]);
	}
	return 0;
}

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


int main(void){
	string org;
	getline(cin,org);

	for(int i=0; i<26; i++){
		for(int j=0; j<org.size(); j++){
			if( org[j] == '.' || org[j] == ' ' ) {}
			else {
				org[j]++;
				if( org[j] > 'z' )
					org[j] -= 26;
			}
		}
		string::size_type pos;
		pos = org.find("the");
		if( pos != string::npos ){
			cout << org << endl;
		}
		else{
			pos = org.find("this");
			if( pos != string::npos ){
				cout << org << endl;
			}
			else{
			pos = org.find("that");
			if( pos != string::npos ){
				cout << org << endl;
			}
			}
		}
	}
	return 0;
}

C++: #include <iostream>
#include <string.h>
#include <string>
#include <stdio.h>
using namespace std;
int main() {
	string w[3]={"the","this","that"},st;
	int wn[3]={3,4,4},k,i,j,s,f;
	while(getline(cin,st)) {
    k=0; 
	while(k<st.size()) {
		for (i=0;i<3;i++) {
			s=0; f=0;
			if (st.size()<k+wn[i]) break;
			for (j=0;j<wn[i]-1;j++) if (((w[i][j]-w[i][j+1]+26) % 26)==((st[k+j]-st[k+j+1]+26) % 26)) s++;
			if (s==wn[i]-1)  { f=1; i=5;}
		}
		if (f==1) break;
		for (k;st[k]>='a' && st[k]<='z' ; k++);
		k++;
	}
	if (f==0) cout << st; else {
		for (i=0;i<st.size();i++) 
			if ((st[i]>='a' && st[i]<='z')) cout << (char)(((st[i]-st[k]+'t')-97+26) % 26 + 97) ; 
		    else cout << st[i];
	}
	cout << endl;
	}
	return 0;
	}

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

using namespace std;
static const int MAXV = 81;

bool hantei(char* data);
void irekae(char* data);

int main() {
  while(!feof(stdin)) {
    char data[MAXV];
    if(fgets(data, sizeof(data), stdin)==NULL) break;
    while(!hantei(data))
      irekae(data);
    printf("%s", data);
  }
}

bool hantei(char* data) {
  if(strstr(data, "the")) return 1;
  if(strstr(data, "this")) return 1;
  if(strstr(data, "that")) return 1;
  return 0;
}

void irekae(char* data) {
  for(int i=0;data[i]!=0;i++) {
    if(data[i]>='a' && data[i]<='z') {
      if(data[i]=='z')data[i]='a';
      else data[i]++;
    }
  }
}