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

string J(string s){
  if(s.length()==0)return s;
  string ret="";
  ret+=s[s.length()-1];
  for(int i=0; i<s.length()-1; i++)ret+=s[i];
  return ret;
}
string C(string s){
  if(s.length()==0)return s;
  string ret="";
  for(int i=1; i<s.length(); i++)ret+=s[i];
  ret+=s[0];
  return ret;
}
string E(string s){
  if(s.length()==0)return s;
  string ret1="", ret2="";
  for(int i=0; i<s.length()/2; i++)ret1+=s[i];
  for(int i=(s.length()+1)/2; i<s.length(); i++)ret2+=s[i];
  if(s.length()%2==1)ret2+=s[s.length()/2];
  return ret2+ret1;
}
string A(string s){
  reverse(s.begin(), s.end());
  return s;
}
string P(string s){
  for(int i=0; i<s.length(); i++){
    if('0'<=s[i]&&s[i]<='9'){
      if(s[i]=='0')s[i]='9';
      else s[i]-=1;
    }
  }
  return s;
}
string M(string s){
  for(int i=0; i<s.length(); i++){
    if('0'<=s[i]&&s[i]<='9'){
      if(s[i]=='9')s[i]='0';
      else s[i]+=1;
    }
  }
  return s;
}

int main(){
  int n;
  cin>>n;
  while(n--){
    string p, m;
    cin>>p;
    cin>>m;
    for(int i=p.length()-1; i>=0; i--){
      if(p[i]=='J')m=J(m);
      if(p[i]=='C')m=C(m);
      if(p[i]=='E')m=E(m);
      if(p[i]=='A')m=A(m);
      if(p[i]=='P')m=P(m);
      if(p[i]=='M')m=M(m);
    }
    cout<<m<<endl;
  }
  return 0;
}

C++: #include <iostream>
#include <algorithm>
#define between(n,x,m) (((n)<=(x))&&((x)<=(m)))

using namespace std;
string filter,str;

void J(){rotate(str.begin(),str.begin()+(str.length()-1),str.end());}
void C(){rotate(str.begin(),str.begin()+1,str.end());}
void E(){
  int i=(str.length())/2;
  string tmp=str;
  str.replace(0,i,tmp,str.length()-i,i);
  str.replace(str.length()-i,i,tmp,0,i);
}

void A(){reverse(str.begin(),str.end());}

void P(){
  int i=str.length();
  char *p=(char*)str.data();
  for(;i>=0;--i){
    if(between('0',p[i],'9')){
	  p[i]--;
	  if(p[i]=='/')p[i]='9';
	}
  }
}

void M(){
  int i=str.length();
  char *p=(char*)str.data();
  for(;i>=0;--i){
    if(between('0',p[i],'9')){
	  p[i]++;
	  if(p[i]==':')p[i]='0';
	}
  }
}


struct x{
  void operator()(char c){
    switch(c){
	  case 'J': J();break;
	  case 'C': C();break;
	  case 'E': E();break;
	  case 'A': A();break;
	  case 'P': P();break;
	  default:  M();break;
	}
  }
};

int main(){
  int n;
  cin >> n;
  while(n--){
    cin >> filter;
	cin >> str;
	for_each(filter.rbegin(), filter.rend(), x());
	cout << str << endl;
  }
  return 0;
}

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

using namespace std;

int main() {
	int n; cin >> n;
	while (n--) {
		string s, message; cin >> s >> message;
		int msz = message.size();
		for (int i = s.size() - 1; i >= 0; --i) {
			if (s[i] == 'J') {
				message = message[msz - 1] + message.substr(0, msz - 1);
			} else if (s[i] == 'C') {
				message = message.substr(1, msz - 1) + message[0];
			} else if (s[i] == 'E') {
				for (int j = 0; j < msz / 2; ++j) swap(message[j], message[j + (msz + 1) / 2]);
			} else if (s[i] == 'A') {
				reverse(message.begin(), message.end());
			} else if (s[i] == 'P') {
				for (int j = 0; j < msz; ++j)
					if (isdigit(message[j])) message[j] = ((message[j] - '0' + 9) % 10) + '0';
			} else if (s[i] == 'M') {
				for (int j = 0; j < msz; ++j)
					if (isdigit(message[j])) message[j] = ((message[j] - '0' + 1) % 10) + '0';
			}
		}
		cout << message << endl;
	}

	return 0;
}