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 <algorithm>
#include <iostream>
#include <limits.h>
#include <math.h>
#include <set>
#include <stack>
#include <stdlib.h>
#include <string>
#include <vector>

#define el endl
#define fd fixed
#define INF INT_MAX/2-1
#define pb push_back

using namespace std;

string num = "0123456789";

string mrj(string s) {
  return s[s.length()-1] + s.substr(0, s.length()-1);
}

string missc(string s) {
  return s.substr(1, s.length()-1) + s[0];
}

string mre(string s) {
  if (s.length() % 2 == 1) return s.substr(s.length()/2+1, s.length()/2) + s[s.length()/2] + s.substr(0, s.length()/2);
  else return s.substr(s.length()/2, s.length()/2) + s.substr(0, s.length()/2);
}

string mra(string s) {
  string res = "";
  for (int i = s.length()-1; i >= 0; i--) {
    res += s[i];
  }
  return res;
}

string drp(string s) {
  for (int i = 0; i < s.length(); i++) {
    int index = (int)num.find(s[i]);
    if (index >= 0) {
      s[i] = num[(index+9)%10];
    }
  }
  return s;
}

string mrm(string s) {
  for (int i = 0; i < s.length(); i++) {
    int index = (int)num.find(s[i]);
    if (index >= 0) {
      s[i] = num[(index+1)%10];
    }
  }
  return s;
}

int main() {
  int n;
  string order, message;
  cin >> n;
  while (n--) {
    cin >> order >> message;
    for (int i = order.length()-1; i >= 0; i--) {
      if (order[i] == 'J') message = mrj(message);
      if (order[i] == 'C') message = missc(message);
      if (order[i] == 'E') message = mre(message);
      if (order[i] == 'A') message = mra(message);
      if (order[i] == 'P') message = drp(message);
      if (order[i] == 'M') message = mrm(message);
    }
    cout << message << el;
  }
}

C++: #include <iostream>
#include <string>
#include <algorithm>
using namespace std;
 
int main()
{
  int n;
  cin>>n;
  for(int i=0;i<n;i++){
    string ord,mes;
    cin>>ord>>mes;
    reverse(ord.begin(),ord.end());
    for(int j=0;j<ord.size();j++){
      char c=ord[j];
      
      if(c=='J'){
	rotate(mes.begin(),mes.begin()+mes.size()-1,mes.end());
      }else if(c=='C'){
	rotate(mes.begin(),mes.begin()+1,mes.end());
      }else if(c=='E'){
	string x,y,z;
	for(int k=0;k<mes.size()/2;k++){
	  x.push_back(mes[k]);
	}
	if(mes.size()%2==1) y.push_back(mes[mes.size()/2]);
	for(int k=mes.size()/2+(mes.size()%2?1:0);k<mes.size();k++){
	  z.push_back(mes[k]);
	}
	mes=z+y+x;
      }else if(c=='A'){
	reverse(mes.begin(),mes.end());
      }else if(c=='P'){
	for(int k=0;k<mes.size();k++){
	  if('1'<=mes[k]&&mes[k]<='9') mes[k]-=1;
	  else if(mes[k]=='0') mes[k]='9';
	}
      }else if(c=='M'){
	for(int k=0;k<mes.size();k++){
	  if('0'<=mes[k]&&mes[k]<='8') mes[k]+=1;
	  else if(mes[k]=='9') mes[k]='0';
	}
      }
    }
    cout<<mes<<endl;
  }
}

C++: #include <iostream>
#include <string>
#include <algorithm>
#include <cctype>
#define FOR(i,a,b) for(int i=(a);i<(b);i++)
#define REP(i,n) for(int i=0;i<(n);i++)
using namespace std;

int main()
{
  int n;
  cin >> n;
  REP(i,n){
    string o, m;
    cin >> o >> m;
    reverse(o.begin(), o.end());
    REP(j,(int)o.size()){
      if(o[j] == 'J'){
        m = m[m.size()-1] + m.substr(0,m.size()-1);
      }else if(o[j] == 'C'){
        m = m[0] + m.substr(1,m.size()-1);
      }else if(o[j] == 'E'){
        int x = m.size()/2;
        if(m.size() & 1)
          m = m.substr(x+1,x) + m[x] + m.substr(0,x);
        else
          m = m.substr(x,x) + m.substr(0,x);
      }else if(o[j] == 'A'){
        reverse(m.begin(), m.end());
      }else if(o[j] == 'P'){
        REP(k,(int)m.size()){
          if(isdigit(m[k])){
            m[k]--;
            if(!isdigit(m[k]))
              m[k] = '9';
          }
        }
      }else if(o[j] == 'M'){
        REP(k,(int)m.size()){
          if(isdigit(m[k])){
            m[k]++;
            if(!isdigit(m[k]))
              m[k] = '0';
          }
        }
      }
    }
    cout << m << endl;
  }
}

C++: #include<iostream>
#include<algorithm>
using namespace std;
string s;
int len;

void funcJ(){
  if(len==1)return;
  char tmp=s[len-1];
  for(int i=len-1;i>0;i--)s[i]=s[i-1];
  s[0]=tmp;
}

void funcC(){
  if(len==1)return;
  char tmp=s[0];
  for(int i=0;i+1<len;i++)s[i]=s[i+1];
  s[len-1]=tmp;
}

void funcE(){
  if(len==1)return;

  if(len%2){
    s=s.substr(len/2+1,len/2)+s[len/2]+s.substr(0,len/2);
  }else{
    s=s.substr(len/2,len/2)+s.substr(0,len/2);
  }
}

void funcA(){
  reverse(s.begin(),s.end());
}

void funcP(){
  for(int i=0;i<len;i++){
    if(s[i]=='0'){
      s[i]='9';
    }else if('1'<=s[i]&&s[i]<='9'){
      s[i]--;
    }
  }
}

void funcM(){
  for(int i=0;i<len;i++){
     if(s[i]=='9'){
       s[i]='0';
     }else if('0'<=s[i]&&s[i]<='8'){
       s[i]++;
     }
  }
}

int main(){
  int n;
  string A;
  cin>>n;
  while(n--){
    cin>>A>>s;
    len=s.size();
    reverse(A.begin(),A.end());
    for(int i=0;i<(int)A.size();i++){
      if(A[i]=='M')funcM();
      if(A[i]=='P')funcP();
      if(A[i]=='A')funcA();
      if(A[i]=='E')funcE();
      if(A[i]=='C')funcC();
      if(A[i]=='J')funcJ();
    }
    cout<<s<<endl;
  }
  return 0;
}