Go: package main

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

func main() {
	io := NewIo()
	defer io.Flush()
	for {
		n := io.NextInt()
		if n == 0 {
			break
		}
		k := make([]int, n)
		for i := 0; i < n; i++ {
			k[i] = io.NextInt()
		}
		const st = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ"
		s := io.NextLine()
		for i, cnt := 0, 0; i < len(s); i, cnt = i+1, (cnt+1)%n {
			idx := strings.IndexRune(st, rune(s[i]))
			c := st[(idx-k[cnt]+52)%52]
			io.Printf("%c", c)
		}
		io.Println()
	}
}

// I/O template
type Io struct {
	reader    *bufio.Reader
	writer    *bufio.Writer
	tokens    []string
	nextToken int
}

func NewIo() *Io {
	return &Io{
		reader: bufio.NewReader(os.Stdin),
		writer: bufio.NewWriter(os.Stdout),
	}
}

func (io *Io) Flush() {
	err := io.writer.Flush()
	if err != nil {
		panic(err)
	}
}

func (io *Io) NextLine() string {
	var buff []byte
	for {
		line, isPrefix, err := io.reader.ReadLine()
		if err != nil {
			panic(err)
		}
		buff = append(buff, line...)
		if !isPrefix {
			break
		}
	}
	return string(buff)
}

func (io *Io) Next() string {
	for io.nextToken >= len(io.tokens) {
		line := io.NextLine()
		io.tokens = strings.Fields(line)
		io.nextToken = 0
	}
	s := io.tokens[io.nextToken]
	io.nextToken++
	return s
}

func (io *Io) NextInt() int {
	i, err := strconv.Atoi(io.Next())
	if err != nil {
		panic(err)
	}
	return i
}

func (io *Io) NextFloat() float64 {
	i, err := strconv.ParseFloat(io.Next(), 64)
	if err != nil {
		panic(err)
	}
	return i
}

func (io *Io) Println(a ...interface{}) {
	fmt.Fprintln(io.writer, a...)
}

func (io *Io) Printf(format string, a ...interface{}) {
	fmt.Fprintf(io.writer, format, a...)
}

func (io *Io) PrintIntSlice(a []int) {
	b := make([]interface{}, 0, len(a))
	for _, x := range a {
		b = append(b, x)
	}
	io.Println(b...)
}

func (io *Io) PrintStringSlice(a []string) {
	b := make([]interface{}, 0, len(a))
	for _, x := range a {
		b = append(b, x)
	}
	io.Println(b...)
}

func Log(name string, value interface{}) {
	fmt.Fprintf(os.Stderr, "%s=%+v\n", name, value)
}

func ExampleIo() {
	io := NewIo()
	defer io.Flush()
	a := make([]int, 0, 3)
	a[0], a[1], a[2] = io.NextInt(), io.NextInt(), io.NextInt()
	io.Println(a)
	io.PrintIntSlice(a)
	Log("io", a)
}

C++: /*
Hokudai Practice Contest 2014
A - King's Inspection

ティツァツ」テヲツウツ陛ッツシツ堙」ツつキテ」ツδ淌」ツδ・テ」ツδャテ」ツδシテ」ツつキテ」ツδァテ」ツδウ
テヲツ崢クテ」ツ?凝」ツつ古」ツ?ヲテ」ツ??」ツつ凝」ツδォテ」ツδシテ」ツδォテ」ツ?ォテ・ツセツ禿」ツ?」テ」ツ?ヲテ・ツセツゥテ・ツ?ε」ツ?凖」ツつ凝」ツ??」ツ?妥」ツ??
テ」ツδォテ」ツδシテ」ツδォテ」ツつ津・ツ?催ァツ渉セテ」ツ?凖」ツつ凝」ツ?淌」ツつ?」ツ?ォテ」ツ?ッテ」ツδェテ」ツつケテ」ツδ暗」ツ?ョテ・ツセツェテァツ陳ーテ」ツつ?ヲツ鳴?・ツュツ療」ツ?ョテ・ツセツェテァツ陳ーテ」ツつ津・ツ?催ァツ渉セテ」ツ?凖」ツつ凝・ツソツ?ィツヲツ?」ツ?古」ツ?づ」ツつ凝」ツ??
(M-1)+1 -> 0, 0-1 -> (M-1)テ」ツ??」ツ?ィテ」ツ?ェテ」ツつ凝」ツつ暗」ツ??」ツ?ォテ」ツ?凖」ツつ凝」ツ?ォテ」ツ?ッテ」ツ??・ツ可ーテ、ツスツ?%)テ」ツつ津ァツ板ィテ」ツ??」ツつ古」ツ?ーテ」ツつ暗」ツ??」ツ??

テヲツ卍づゥツ鳴禿ィツィツ暗ァツョツ療ゥツ?湘ッツシツ唹(|s|)
テァツゥツコテゥツ鳴禿ィツィツ暗ァツョツ療ゥツ?湘ッツシツ唹(n + |s|)
*/

#include<iostream>
#include<cctype>
using namespace std;

//a-zA-z -> テゥツ??ァツ閉ェ
int toInt(char a){
  if(islower(a))return a-'a';
  return a-'A'+26;
}

//テゥツ??ァツ閉ェ -> a-zA-Z
char toChar(int a){
  if(a<26)return 'a'+a;
  return 'A'+a-26;
}

//テゥツァツ?ヲツ閉ー
const int M = 52;

int main(){
  int n,k[100];
  string s;

  while(cin >> n,n){
    for(int i=0;i<n;i++)cin >> k[i];
    cin >> s;

    for(int i=0;i<(int)s.size();i++){
      //テ・ツセツェテァツ陳ーテ」ツつ津」ツつキテ」ツδ淌」ツδ・テ」ツδャテ」ツδシテ」ツつキテ」ツδァテ」ツδウテ」ツ?凖」ツつ凝」ツ?ォテ」ツ?ッmodテ」ツつ津、ツスツソテ」ツ?暗」ツ?ーティツ可ッテ」ツ??
      int tmp = toInt(s[i]) - k[i%n];
      //ティツイツ?ヲツ閉ーテ」ツつづ」ツ?づ」ツつ甘・ツセツ療」ツつ凝・ツ?エテ・ツ青暗」ツ?ョテ・ツョツ嘉・ツ?ィテ」ツ?ェmodテ」ツ?ョテ・ツ渉姪」ツつ甘ヲツ鳴ケテ」ツ?ッ((x%mod) + mod)%mod
      tmp = ((tmp%M) + M) % M;
      cout << toChar(tmp);
    }
    cout << endl;
  }
}

C++: #include<iostream>
#include<string>
#include<vector>
#include<utility>
#include<queue>
#include<algorithm>
#include<cmath>
#include<cstdio>
#include<cstring>
#include<cstdlib>
#include<map>
#include<complex>
#define INF 2147483647
#define llINF 9223372036854775807
#define pb push_back
#define mp make_pair 
#define F first
#define S second
#define ll long long

using namespace std;
int main(){
  int n;
  while(cin>>n,n){
    vector<int>key;
    for(int i=0;i<n;i++){
      int a;cin>>a;
      key.pb(a);
    }
    string s;cin>>s;
    string str="abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ";
    str=str+str;
    str=str+str;
    string ans="";
    map<char,int>alfa;
    for(char c='a';c<='z';c++)
      alfa[c]=(52+c-'a');
    for(char c='A';c<='Z';c++)
      alfa[c]=(52+26+c-'A');
    for(int i=0;i<s.size();i++){
      char c=str[alfa[s[i]]-key[i%n]];
      ans+=c;
    }
    cout<<ans<<endl;
  }
  return 0;
}

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

bool notrange(char a){
  return (!(('a' <= a && a <= 'z') || ('A' <= a && a <= 'Z')));
}

int main(){
  
  while(1){
  	int n;
  	cin >> n;
  	if(n == 0) break;
  	int i;
  	int k[100];
  	for (i = 0; i < n; i++) {
  	  cin >> k[i];
  	}
  	string str = "";
  	cin >> str;
  	int j;
  	string str2 = "";
  	int a = 0;
	
  	for(j = 0;j < (int) str.length();j++){
  	  a = j;
  	  while(!(a < i)){
  		a -= i;
  	  }

  	  char c = str[j] - k[a];
	  
  	  if(c < 'a' && c > 'Z' && notrange(c)){
		// cout << 'a' -c << endl;
  		c = 'Z'-('a' - c - 1);
  	  }
  	  if(c < 'A' && notrange(c)){
  		c = 'z' - ('A' - c - 1);
  	  }
	  if(c < 'a' && c > 'Z' && notrange(c)){
  		c = 'Z'-('a' - c - 1);
  	  }

  	  cout << c;
  	}
  	cout << endl;
  }

  return 0;
}

C++: #include <iostream>
#include <iomanip>
#include <vector>
#include <algorithm>
#include <string>
#include <cstdio>
#include <cmath>
#include <map>
using namespace std;

int main()
{
	char a[53];
	for (int i = 0; i < 26; ++i)
	{
		a[i] = (char)('A' + i);
	}
	for (int i = 0; i < 26; ++i)
	{
		a[26 + i] = (char)('a' + i);
	}
	int n;
	int k[100];
	char s[101];
	while(cin >> n && n != 0){
		int c = 0;
		for (int i = 0; i < n; ++i)
		{
			cin >> k[i];
		}
		k[n] = '\0';
		cin >> s;
		for (int i = 0; s[i] != '\0'; ++i)
		{
			for (int j = 0; j < 52; ++j)
			{
				if(s[i] == a[j]){
					if(j - k[c] >= 0){
						cout << a[j - k[c]];
					}else{
						cout << a[52 - k[c] + j];
					}
				}
			}
		c++;
		if(c == n){
			c = 0;
			}
		}
		c++;
		if(c == n){
			c = 0;
		}
		cout << endl;
	}
}

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

int main(){
  int n;
  map <char, int> mp;
  for(int i=0; i<26; ++i){
    mp[(char)('a'+i)] = i;
  }

  for(int i=0; i<26; ++i){
    mp[(char)('A'+i)] = i+26;
  }

  // for(auto i:mp){
  //cout << i.first << endl;
  //}
  while(cin >> n,n){
    vector<int> v;
    string str;
    
    for(int i=0; i<n; ++i){
      int tmp;
      cin >> tmp;
      v.push_back(tmp);
    }
    cin >> str;

    int cnt = 0;
    for(int i=0; i<str.size(); ++i){
      int tmp = 52 + mp[str[i]] - v[cnt];
      tmp = tmp%52;
      for(auto j:mp){
	if(j.second == tmp)cout << j.first;
      }
      ++cnt;
      if(cnt >= v.size())cnt=0;
    }
    cout << endl;
  }
  return 0;
}