Go: package main

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

func main() {
	io := NewIo()
	defer io.Flush()
	n := io.NextInt()
	for i := 0; i < n; i++ {
		s, t := io.NextLine(), io.NextLine()
		io.Println(f(s, t))
	}
}

func f(s, t string) string {
	for i := len(s) - 1; i >= 0; i-- {
		switch s[i] {
		case 'C':
			t = strings.Join([]string{t[1:], string(t[0])}, "")
		case 'J':
			t = strings.Join([]string{string(t[len(t)-1]), t[:len(t)-1]}, "")
		case 'E':
			if len(t)%2 == 1 {
				t = strings.Join([]string{t[len(t)/2+1:], string(t[len(t)/2]), t[:len(t)/2]}, "")
			} else {
				t = strings.Join([]string{t[len(t)/2:], t[:len(t)/2]}, "")
			}
		case 'A':
			r := []rune(t)
			for i, n := 0, len(r); i < n/2; i++ {
				r[i], r[n-i-1] = r[n-i-1], r[i]
			}
			t = string(r)
		case 'M':
			r := []rune(t)
			for i := 0; i < len(r); i++ {
				if '0' <= r[i] && r[i] < '9' {
					r[i]++
				} else if r[i] == '9' {
					r[i] = '0'
				}
			}
			t = string(r)
		case 'P':
			r := []rune(t)
			for i := 0; i < len(r); i++ {
				if '0' < r[i] && r[i] <= '9' {
					r[i]--
				} else if r[i] == '0' {
					r[i] = '9'
				}
			}
			t = string(r)
		}
	}
	return t
}

// 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 <vector>
#include <string>
#include <algorithm>
#define rep(i,a) for(int i = 0 ; i < a ; i ++)

using namespace std;

int main(void){
  int N;
  cin>>N;
  while(N--){
    string a,s;
    cin>>a>>s;
    reverse(a.begin(),a.end());
    rep(i,a.size()){
      switch(a[i]){
        case 'A':
          reverse(s.begin(),s.end());
          break;
        case 'J':
          s=s.substr(s.size()-1)+s.substr(0,s.size()-1);
          break;
        case 'C':
          s=s.substr(1)+s.substr(s.size()-1);
          break;
        case 'M':
          rep(i,s.size()){
            if('0'<=s[i]&&s[i]<='9'){
              if(s[i]=='9')s[i]='0';
              else s[i]++;
            }
          }
          break;
        case 'P':
          rep(i,s.size()){
            if('0'<=s[i]&&s[i]<='9'){
              if(s[i]=='0')s[i]='9';
              else s[i]--;
            }
          }
          break;
        case 'E':
          int l = s.size()/2;
          if(s.size()%2)
            s = s.substr(s.size()-l) + s[l] + s.substr(0,l);
          else
            s = s.substr(s.size()-l) + s.substr(0,l);
          break;
      }
    }
      cout<<s<<endl;
    
  }
}

C++: #include <string>
#include <iostream>

using namespace std;

string turn1(string S)
{
	return S.substr(1, S.size() - 1) + S[0];
}

string turn2(string S)
{
	return S[S.size() - 1] + S.substr(0, S.size() - 1);
}

string turn3(string S)
{
	string T;

	if (S.size() % 2 == 1)
	{
		T = S.substr(S.size() / 2 + 1, S.size() / 2) + S[S.size() / 2] + S.substr(0, S.size() / 2);
	}
	else
	{
		T = S.substr(S.size() / 2, S.size() / 2) + S.substr(0, S.size() / 2);
	}

	return T;
}

string turn4(string S)
{
	reverse(S.begin(), S.end());

	return S;
}

string turn5(string S)
{
	for (int i = 0; i < S.size(); i++)
	{
		if (isdigit(S[i]))
		{
			if (S[i] == '9')
			{
				S[i] = '0';
			}
			else
			{
				S[i]++;
			}
		}
	}
}

string turn6(string S)
{
	for (int i = 0; i < S.size(); i++)
	{
		if (isdigit(S[i]))
		{
			if (S[i] == '0')
			{
				S[i] = '9';
			}
			else
			{
				S[i]--;
			}
		}
	}
}

int main()
{
	int n; string S, T;

	cin >> n;

	for (int i = 0; i < n; i++)
	{
		cin >> S >> T;

		for (int i = S.size() - 1; i >= 0; i--)
		{
			switch (S[i])
			{
				case 'C': T = turn1(T); break;
				case 'J': T = turn2(T); break;
				case 'E': T = turn3(T); break;
				case 'A': T = turn4(T); break;
				case 'M': T = turn5(T); break;
				case 'P': T = turn6(T); break;
			}
		}

		cout << T << endl;
	}

	return 0;
}

C++: #include <iostream>
#include <string>
#include <vector>
#include <algorithm>
#define REP(i,n) for (int i=0;i<(n);i++)
#define ll long long
#define ull unsigned long long
int dx[4] = {1, 0, -1, 0};
int dy[4] = {0, 1, 0, -1};

using namespace std;

string invJ(string s){//???????????????
	rotate(s.rbegin(),s.rbegin() + 1,s.rend());
	return s;
}

string invC(string s){//left????????????
	rotate(s.begin(),s.begin() + 1,s.end());
	return s;
}

string invE(string s){
	if((s.size() + 1) & 1)
		rotate(s.begin(),s.begin() + s.size()/2,s.end());
	else{
		string tmp;
		tmp = s;
		s.replace(0,s.size()/2,s.substr(s.size()/2 + 1,s.size()/2));
		s.replace(s.size()/2 + 1,s.size()/2,tmp.substr(0,s.size()/2));
	}
	return s;
}

string invA(string s){
	reverse(s.begin(),s.end());
	return s;
}

string invP(string s){
	REP(i,s.size()){
		if(s[i] == '0')
			s[i] = '9';
		else if(s[i] > '0' && s[i] <= '9')
			s[i]--;
	}
	return s;
}

string invM(string s){
	REP(i,s.size()){
		if(s[i] == '9')
			s[i] = '0';
		else if(s[i] >= '0' && s[i] < '9')
			s[i]++;
	}
	return s;
}

int main(){
  cin.tie(0);
  ios::sync_with_stdio(false);
	int n;
	cin >> n;
	while(n--){
		string command,s;
		cin >> command >> s;
		for(int i = command.size()-1;i>=0;i--){
			if(command[i] == 'J')s = invJ(s);
			else if(command[i] == 'C')s = invC(s);
			else if(command[i] == 'E')s = invE(s);
			else if(command[i] == 'A')s = invA(s);
			else if(command[i] == 'P')s = invP(s);
			else if(command[i] == 'M')s = invM(s);
		}
		cout << s << endl;
	}
  return 0;
}