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++: 
#include <iostream>
#include <cstdlib>
#include <cstdio>
#include <cstring>
#include <cmath>
#include <stack>
#include <cctype>
#include <complex>
#include <vector>
#include <set>
#include <map>
#include <algorithm>
#include <cassert>

using namespace std;


bool solve(){
	int n;
	cin>> n;
	if(!n) return false;
	vector<int> a(n);
	for(int i=0;i<n;i++){
		cin>> a[i];
	}
	string str;
	cin>> str;
	
	for(int i=0;i<str.size();i++){
		int k = a[i%n];
		char c = str[i];
		if(islower(c)){
			if(islower(c-k)){
				c -= k;
			}else{
				k -= c - 'a';
				c = 'Z' - (k%26 - 1);
			}
		}else if(isupper(c)){
			if(isupper(c-k)){
				c -= k;
			}else{
				k -= c - 'A';
				c = 'z' - (k%26 - 1);
			}
		}
		cout<< c;
	}
	cout<< endl;

	return true;
}

int main(){
	cout.setf(ios::fixed);
	cout.precision(10);
	while(solve()){}

	return 0;
}

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

using namespace std;

int c2i[128], i2c[52];

int main()
{
    for(int i=0; i<26; i++)
    {
        c2i['a'+i] = i;
        c2i['A'+i] = i + 26;
        i2c[i] = 'a' + i;
        i2c[i+26] = 'A' + i;
    }

    int n;
    while(cin >> n, n)
    {
        int ks[n];
        for(int i=0; i<n; i++) cin >> ks[i];
        string s;
        cin >> s;
        for(int i=0; i<s.size(); i++) s[i] = i2c[(c2i[s[i]] - ks[i%n]  + 52) % 52];
        cout << s << endl;
    }
}

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

int main(){
  while(1){
    int n,i,j,key_num,temp;
    vector <int> key;
    vector <char> result;
    string angou;
    string moji="abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ";
    
    cin >> n;
    if(n==0)break;
    result.clear();
    key.clear();
    
    for(i = 0; i < n; i++){
      cin >> key_num;
      key.push_back(key_num);
    }
      
    cin >> angou;
    int len = key.size();
    int len2 = angou.size();
    int k = 0; 
    for(i = 0; i < len2; i++){
      for(j = 0; j < 52; j++){
	
	if(moji[j]==angou[i]){
	  result.push_back(moji[j+52-key[k]]);
	  cout << "moji[j+52]" << moji[j+52] << endl;
	  cout << "key[k] " << key[k] << endl;
	  cout << "moji[j+52-key[k]]" << moji[j+52-key[k]] << endl;
	  // cout << "k " << k << endl;
	  k++;
	  if(k==len)k = 0;
	}
      }
    }
    int len3 = result.size();
    for(i = 0; i < len3; i++){
      cout << result[i];
    }
    cout << endl;
  }
  return 0;
}