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>
#include <cctype>
using namespace std;

const char person[] = {'J', 'C', 'E', 'A', 'P', 'M'};

vector<char> decode(const vector<char>& messangers, const vector<char>& message){
  vector<char> ans;

  for(int i=0;i<message.size();++i){
    ans.push_back(message[i]);
  }

  for(int i=messangers.size()-1;i>=0;--i){
    if(messangers[i]==person[0]){
      for(int j=ans.size()-1;j>0;--j){
        swap(ans[j],ans[j-1]);
      }
    }else if(messangers[i]==person[1]){
      for(int j=0;j<ans.size()-1;++j){
        swap(ans[j],ans[j+1]);
      }
    }else if(messangers[i]==person[2]){
      for(int j=0,k;j<ans.size()/2;++j){
        ans.size()%2==1 ? k=ans.size()/2+1 : k=ans.size()/2;
        swap(ans[j],ans[j+k]);
      }
    }else if(messangers[i]==person[3]){
      reverse(ans.begin(), ans.end());
    }else if(messangers[i]==person[4]){
      for(int j=0;j<ans.size();++j){
        if(isdigit(ans[j])){
          if(ans[j]=='0') ans[j]='9';
          else --ans[j];
        }
      }
    }else if(messangers[i]==person[5]){
      for(int j=0;j<ans.size();++j){
        if(isdigit(ans[j])){
          if(ans[j]=='9') ans[j]='0';
          else ++ans[j];
        }
      }
    }
  }

  return ans;
}

int main(){
  int n;
  cin>>n;

  for(int index=0;index<n;++index){
    vector<char> messangers,message;
    string tmp;

    cin>>tmp;
    for(int i=0;i<tmp.size();++i)
      messangers.push_back(tmp.at(i));

    cin>>tmp;
    for(int i=0;i<tmp.size();++i)
      message.push_back(tmp.at(i));

    vector<char> ans;
    ans = decode(messangers, message);

    for(int i=0;i<ans.size();++i)
      cout << ans.at(i);
    
    cout << endl;
  }

  return 0;
}

C++: //1240
#include<iostream>
#include<string>
#include<algorithm>
using namespace std;
char table[10]={'0','1','2','3','4','5','6','7','8','9'};
string now;
void A(){
reverse(now.begin(),now.end());
}
void J(){
char tmp=now[0];
for(int i=0;i<now.size()-1;i++)now[i]=now[i+1];
now[now.size()-1]=tmp;
}
void E(){
string a="",b="",c="";
for(int i=0;i<now.size();i++){
if(i<now.size()/2)a.push_back(now[i]);
else if(i==now.size()/2&&now.size()%2==1)c.push_back(now[i]);
else b.push_back(now[i]);
}
//reverse(a.begin(),a.end());
//reverse(b.begin(),b.end());
now=b+c+a;
}
void C(){
char tmp=now[now.size()-1];
for(int i=now.size()-1;i>0;i--)now[i]=now[i-1];
now[0]=tmp;
}
void P(){
for(int i=0;i<now.size();i++){
	if(now[i]-'0'==0)now[i]='9';
else 	if(now[i]-'0'==1)now[i]='0';
else 	if(now[i]-'0'==2)now[i]='1';
else 	if(now[i]-'0'==3)now[i]='2';
else 	if(now[i]-'0'==4)now[i]='3';
else 	if(now[i]-'0'==5)now[i]='4';
else 	if(now[i]-'0'==6)now[i]='5';
else 	if(now[i]-'0'==7)now[i]='6';
else 	if(now[i]-'0'==8)now[i]='7';
else 	if(now[i]-'0'==9)now[i]='8';
	}
}
void M(){
for(int i=0;i<now.size();i++){
	if(now[i]-'0'==0)now[i]='1';
	else if(now[i]-'0'==1)now[i]='2';
	 else if(now[i]-'0'==2)now[i]='3';
else 	if(now[i]-'0'==3)now[i]='4';
else 	if(now[i]-'0'==4)now[i]='5';
else 	if(now[i]-'0'==5)now[i]='6';
else 	if(now[i]-'0'==6)now[i]='7';
else 	if(now[i]-'0'==7)now[i]='8';
else 	if(now[i]-'0'==8)now[i]='9';
else 	if(now[i]-'0'==8)now[i]='0';
	}
}

int main(){
	int n;
	cin>>n;
for(int kki=0;kki<n;kki++){
	string a;
	cin>>a>>now;
	for(int i=a.size();i>=0;i--){
		if(a[i]=='A')A();
		if(a[i]=='C')J();
		if(a[i]=='P')P();
		if(a[i]=='M')M();
		if(a[i]=='E')E();
		if(a[i]=='J')C();
	//cout<<now<<endl;	
	}
	cout<<now<<endl;
}

	return 0;
}