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 <bits/stdc++.h>
using namespace std;

int n;
char buf[114514];

string C(string s) {
  return s.substr(1) + s[0];
}

string J(string s) {
  int k = s.length()-1;
  return s[k] + s.substr(0, k);
}

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

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

string M(string s) {
  int n = s.length();
  for (int i=0; i<n; i++) {
    char c = s[i];
    if ('0' <= c && c <= '9') s[i] = '0' + (c-'0'+1)%10;
  }
  return s;
}

string P(string s) {
  int n = s.length();
  for (int i=0; i<n; i++) {
    char c = s[i];
    if ('0' <= c && c <= '9') s[i] = '0' + (c-'0'+9)%10;
  }
  return s;
}

int main() {
  scanf("%d", &n);
  while (n--) {
    scanf(" %s", buf);
    string order(buf);
    scanf(" %s", buf);
    string msg(buf);

    reverse(order.begin(), order.end());
    for (int i=0; i<order.size(); i++) {
      if (order[i] == 'A') msg = A(msg);
      if (order[i] == 'J') msg = J(msg);
      if (order[i] == 'E') msg = E(msg);
      if (order[i] == 'P') msg = P(msg);
      if (order[i] == 'M') msg = M(msg);
      if (order[i] == 'C') msg = C(msg);
    }

    printf("%s\n", msg.c_str());
  }
}

C++: #include<iostream>
#include<cstdio>
#include<algorithm>
#include<string>
#include<vector>
#include<queue>
#include<set>
#include<functional>
#include<map>
using namespace std;

int main() {
	int a; cin >> a;
	for (int b = 0; b < a; b++) {
		string c, d; cin >> c >> d;
		for (int i = c.length() - 1; i >= 0;i--) {
			char e = c[i];
			switch (e) {
			case 'P':for (int f = 0; f < d.length(); f++) {
				if (d[f] == '0')d[f] = '9';
				else if (d[f] <= '9')d[f]--;
			} break;
			case 'M':for (int f = 0; f < d.length(); f++) {
				if (d[f] == '9')d[f] = '0';
				else if (d[f] <= '9')d[f]++;
			} break;
			case 'C':d = d.substr(1, d.length() - 1) + d[0]; break;
			case 'J':d = d[d.length() - 1] + d.substr(0, d.length() - 1); break;
			case 'A': {string f = d;
				for (int g = 0; g < d.length(); g++) {
					d[g] = f[d.length() - 1 - g];
				}
				break; }
			default: {
				if (d.length() & 1)
				{
					string f = d;
					d = ""; 
					d += f.substr(f.length() - f.length() / 2, f.length() / 2);
					d += f[f.length() / 2];
					d += f.substr(0, f.length() / 2);
				}
				else {
					string f = d;
					d = "";
					d += f.substr(f.length() - f.length() / 2, f.length() / 2);
					d += f.substr(0, f.length() / 2);
				}}
			}
		}
		cout << d << endl;
	}
}

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

using namespace std;

typedef long long ll;
typedef pair<int,int> pii;
typedef vector<int> VI;
typedef vector<VI> VVI;
const double PI = 3.14159265358979323846;
const double EPS = 1e-12;
const int INF = numeric_limits<int>::max() / 2;
const int NEG_INF = numeric_limits<int>::min() / 2;

//????????¨??¢??°???
string MrJ(string s){
  string res="";
  int len=s.length();
  res += s[len-1];
  for(int i=0;i<len-1;i++) res += s[i];
  return res;
}
string MissC(string s){
  string res="";
  int len=s.length();
  for(int i=1;i<len;i++) res += s[i];
  res += s[0];
  return res;
}
string MrE(string s){
  string res="";
  int len=s.length();
  if(len%2==0){
    for(int i=len/2;i<=len-1;i++) res+=s[i];
    for(int i=0;i<=len/2-1;i++) res+= s[i];
  }
  else{
    for(int i=(len+1)/2;i<=len-1;i++) res += s[i];
    res += s[(len-1)/2];
    for(int i=0;i<=(len-3)/2;i++) res += s[i];
  }
  return res;
}
string MrA(string s){
  string res="";
  int len=s.length();
  for(int i=len-1;0<=i;i--) res += s[i];
  return res;
}
string DrP(string s){
  string res="";
  int len=s.length();
  for(int i=0;i<len;i++){
    if(48<s[i] && s[i]<=57){
      res += s[i]-1;
    }
    else if(s[i]==48) res+= "9";
    else res+= s[i];
  }
  return res;
}
string MrM(string s){
  string res="";
  int len=s.length();
  for(int i=0;i<len;i++){
    if(48<=s[i] && s[i]<57){
      res += s[i]+1;
    }
    else if(s[i]==57) res+= "0";
    else res+= s[i];
  }
  return res;
}

int main(){
  cin.tie(0);
  ios::sync_with_stdio(false);

  int n;
  cin >> n;
  for(int i=0;i<n;i++){
    string order;
    string s;
    cin >> order >> s;
    int len=order.length();
    for(int j=len-1;0<=j;j--){
      if(order[j]=='J') s=MrJ(s);
      else if(order[j]=='C') s=MissC(s);
      else if(order[j]=='E') s=MrE(s);
      else if(order[j]=='A') s= MrA(s);
      else if(order[j]=='P') s=DrP(s);
      else s=MrM(s);
    }
    cout << s << endl;
  }
}