Go: package main

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

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 reflect.DeepEqual(infos, []string{}) {
			break
		}
		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 <iostream>
#include <cstdlib>
#include <string>
#include <cctype>
#include <algorithm>
using namespace std;

char cShiftchar(char ch)
{
    if(isalpha(ch))
    {
        if(islower(ch))
        {
        ch++;
        if(ch > 'z') ch = ch - 'z' + 'a' -1;
        }
        if(isupper(ch))
        {
        ch++;
        if(ch > 'Z') ch = ch - 'Z' + 'A' -1;
        }
    }

    return ch;
}

string sDecode(string str)
{
    string ans;
    while( str.find("the")
            && str.find("this")
            && str.find("that")
            && str.find("THE")
            && str.find("THIS")
            && str.find("THAT")
         )
    {
        transform(str.begin(), str.end(), str.begin(), cShiftchar);

    }
    return str;
}

int main()
{
    string str;
    while(getline(cin, str))
    {
        cout << sDecode(str) << endl;
    }
    return EXIT_SUCCESS;
}

C++: #include <bits/stdc++.h>

using namespace std;

int main(){

    string s;

    getline(cin, s);

    for(int i = 0; i < s.size(); ++i){
        if(s[i] >= 'a' && s[i] <= 'z'){
            cout << (char)((s[i] + 1) % 'a' + 'a');
        }
        else cout << ' ';
    }
    cout << endl;

}

C++: #include <cctype>
#include <cstdio>
#include <cstring>

using namespace std;

bool includes_keyword(const char *str) {
  const static char *keywords[] = { "the", "this", "that" };
  for (const auto keyword : keywords) {
    const char *pos = strstr(str, keyword);
    if (pos == NULL) { continue; }
    if (pos != str && isalpha(pos[-1])) { continue; }
    if (isalpha(pos[strlen(keyword)])) { continue; }
    return true;
  }
  return false;
}

int main() {
  while (!feof(stdin)) {
    char cipher[81];
    fgets(cipher, 81, stdin);

    size_t len = strlen(cipher);
    if (cipher[len - 1] == '\n') { cipher[len - 1] = '\0'; }

    char c = 'z';
    for (int i = 0; i < len; ++i) {
      if (isalpha(cipher[i]) && c > cipher[i]) { c = cipher[i]; }
    }
    int shift_begin = 'a' - c;
    int shift_end = shift_begin + 26;
    char decoded[81];
    for (int shift = shift_begin; shift < shift_end; ++shift) {
      strcpy(decoded, cipher);
      for (int i = 0; i < len; ++i) {
        if (isalpha(decoded[i])) { decoded[i] += shift; }
      }
      if (includes_keyword(decoded)) { break; }
    }

    puts(decoded);
  }

  return 0;
}

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

#define NUM_OF_ALPHABET ('z' - 'a' + 1)

bool isValidResult(const std::string str);
bool decodeStr(const std::string srcStr, std::string& dstStr, int decodeNum);

int main(void)
{
	std::string inputStr;
	std::string outputStr;

	char line[100];
	fgets(line, sizeof(line), stdin);
	inputStr = line;

	for (int i = 0; i < NUM_OF_ALPHABET; i++) {
		if (decodeStr(inputStr, outputStr, i)) {
			std::cout << outputStr;
			break;
		}
		outputStr.clear();
	}
	return 0;
}

bool isValidResult(const std::string str)
{
	if (str.find(" the") != std::string::npos || str.find(" this") != std::string::npos || str.find(" that") != std::string::npos ||
		str.find("the ") != std::string::npos || str.find("this ") != std::string::npos || str.find("that ") != std::string::npos ||
		str.find("the")  != std::string::npos || str.find("this")  != std::string::npos || str.find("that")  != std::string::npos) {
		return true;
	}
	else {
		return false;
	}
}

bool decodeStr(const std::string srcStr, std::string& dstStr, int decodeNum)
{
	for (int i = 0; i < srcStr.size(); i++) {
		if (srcStr.at(i) >= 'a' && srcStr.at(i) <= 'z') {
			unsigned char tmpChar;
			tmpChar = srcStr.at(i) + decodeNum;
			if (tmpChar > 'z') {
				tmpChar -= NUM_OF_ALPHABET;
			}
			dstStr.push_back(tmpChar);
		}
		else {
			dstStr.push_back(srcStr.at(i));
		}
	}
	if (isValidResult(dstStr)) {
		return true;
	}
	else {
		return false;
	}
}

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

//#define int long long
#define reps(i,s,n) for(int (i)=(s);(i)<(n);++(i))
#define rep(i,n) reps(i,0,n)
#define rept(i,n) rep(i,(n)+1)
#define repst(i,s,n) reps(i,s,(n)+1)
#define reprt(i,n,t) for(int (i)=(n);(i)>=(t);--(i))
#define repr(i,n) reprt(i,n,0)
#define each(itr,v) for(auto &(itr):(v))
#define all(c) (c).begin(),(c).end()
#define rall(c) (c).rbegin(),(c).rend()
#define pb push_back
#define mp make_pair
#define fi first
#define se second
#define tmax(x,y,z) max(x,max(y,z))
#define tmin(x,y,z) min(x,min(y,z))
#define chmin(x,y) x=min(x,y)
#define chmax(x,y) x=max(x,y)
#define ln '\n'
#define bln(i,n) (((i)==(n)-1)?'\n':' ')
#define dbg(x) cout<<#x" = "<<(x)<<ln<<flush
#define dbga(x,n) {cout<<#x" : ";for(int (i)=0;i<(n);++i){cout<<((x)[i])<<(i==((n)-1)?'\n':' ')<<flush;}}
#define zero(a) memset(a,0,sizeof(a))
#define unq(a) sort(all(a)),a.erase(unique(all(a)),a.end())

typedef complex<double> P;
typedef long long ll;
typedef pair<int,int> pii;
typedef pair<ll,ll> pll;
typedef vector<int> vi;
typedef vector<ll> vl;
typedef vector<string> vst;
typedef vector<pii> vpii;
typedef vector<pll> vpll;
typedef vector<vector<int> > mat;

const ll inf = (ll)1e9+10;
const ll linf = (ll)1e18+10;
const ll mod = (ll)(1e9+7);
const int dx[] = {0, 1, 0, -1};
const int dy[] = {1, 0, -1, 0};
const int ddx[] = {0, 1, 1, 1, 0, -1, -1, -1};
const int ddy[] = {1, 1, 0, -1, -1, -1, 0, 1};
const double eps = 1e-10;

ll mop(ll a,ll b,ll m=mod) {ll r=1;a%=m;for(;b;b>>=1){if(b&1)r=r*a%m;a=a*a%m;}return r;}
ll gcd(ll a,ll b) {return b?gcd(b,a%b):a;}
ll lcm(ll a,ll b) {return a*b/gcd(a,b);}
bool ool(int x,int y,int h,int w) {return((x<0)||(h<=x)||(y<0)||(w<=y));}
bool deq(double a,double b) {return abs(a-b)<eps;}

struct oreno_initializer {
	oreno_initializer() {
		cin.tie(0);
		ios::sync_with_stdio(0);
	}
} oreno_initializer;

// ━━━━☆・‥…━━━☆・‥…━━━☆・‥…━━━☆・‥…━━━☆・‥…━━━☆・‥…━━━☆・‥…━━━☆・‥…━━━☆・‥…
// .｡.:( ^ω^)・ﾟ＋.｡.:( ^ω^)・ﾟ＋.｡.:( ^ω^)・ﾟ＋.｡.:( ^ω^)・ﾟ＋.｡.:( ^ω^)・ﾟ＋
// ・‥…━━━☆・‥…━━━☆・‥…━━━☆・‥…━━━☆・‥…━━━☆・‥…━━━☆・‥…━━━☆・‥…━━━☆・‥…━━━☆・

typedef string::const_iterator S;
string s;

bool ok(S &i, S &e) {
	if (i==e) return 0;
	string t;
	while (*i!=' ') t.pb(*i), i++;
	if ((t.size()>=3 && t.substr(0,3)=="the") || (t.size()>=4 && (t.substr(0,4)=="that" || t.substr(0,4)=="this"))) return 1;
	return ok(++i,e);
}

signed main() {
	getline(cin,s);
	s.pb(' ');
	rep(i,26) {
		S b = s.begin(), c = s.end();
		if (ok(b,c)) return cout << s << ln, 0;
		rep(j,s.size()) if ('a'<=s[j] && s[j]<='z') {
			s[j]++;
			if (s[j]>'z') s[j] = 'a';
		}
	}
}