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 <stdio.h>
#include <cmath>
#include <algorithm>
#include <stack>
#include <queue>
#include <vector>

using namespace std;


int main(){

	int n,length,m_length,index;
	char ORDER[7],message[26],tmp,work[26];

	scanf("%d",&n);

	for(int loop = 0; loop < n; loop++){

		scanf("%s",ORDER);

		for(length = 0; ORDER[length] != '\0';length++);

		scanf("%s",message);

		for(m_length = 0; message[m_length] != '\0';m_length++);

		for(int i = length-1; i >= 0; i--){
			switch(ORDER[i]){
			case 'J':
				tmp = message[m_length-1];
				for(int k = m_length-2; k >=0; k--){
					message[k+1] = message[k];
				}
				message[0] = tmp;
				break;
			case 'C':
				tmp = message[0];
				for(int k = 1; k < m_length; k++){
					message[k-1] = message[k];
				}
				message[m_length-1] = tmp;
				break;
			case 'E':
				if(m_length % 2 == 0){
					index = 0;
					for(int k = m_length/2; k < m_length; k++){
						work[index++] = message[k];
					}
					for(int k = 0; k < m_length/2;k++){
						work[index++] = message[k];
					}
					for(int k = 0; k < m_length; k++)message[k] = work[k];
				}else{
					index = 0;
					for(int k = (m_length+1)/2; k < m_length; k++){
						work[index++] = message[k];
					}
					work[index++] = message[(m_length-1)/2];
					for(int k = 0; k < (m_length-1)/2;k++){
						work[index++] = message[k];
					}
					for(int k = 0; k < m_length; k++)message[k] = work[k];
				}
				break;
			case 'A':
				index = 0;
				for(int k = m_length-1; k >= 0; k--){
					work[index++] = message[k];
				}
				for(int k = 0; k < m_length; k++)message[k] = work[k];
				break;
			case 'P':
				for(int k = 0; k < m_length; k++){
					if(message[k] >= '0' && message[k] <= '9'){
						if(message[k] == '0'){
							message[k] = '9';
						}else{
							message[k] -= 1;
						}
					}
				}
				break;
			case 'M':
				for(int k = 0; k < m_length; k++){
					if(message[k] >= '0' && message[k] <= '9'){
						if(message[k] == '9'){
							message[k] = '0';
						}else{
							message[k] += 1;
						}
					}
				}
				break;
			}
		}

		printf("%s\n",message);
	}

    return 0;
}

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

string j(string s){
	string ret;
	ret += s[s.size()-1];
	for(int unsigned i = 0;i<s.size()-1;i++){
		ret += s[i];
	}
	return ret;
}
string c(string s){
	string ret;
	for(int unsigned i = 1;i<s.size();i++){
		ret += s[i];
	}
	ret += s[0];
	return ret;
}
string e(string s){
	string ret;
	int size = s.size()/2;
	for(int unsigned i = s.size()-size;i<s.size();i++){
		ret += s[i];
	}
	if(s.size()%2){
		ret += s[s.size()/2];
	}
	for(int unsigned i = 0;i<s.size()/2;i++){
		ret += s[i];
	}
	return ret;
}
string a(string s){
	//reverse
	return string(s.rbegin(),s.rend());
}
string p(string s){
	//increments
	string ret;
	for(int unsigned i = 0;i<s.size();i++){
		if(isdigit(s[i])) {
			ret += (char)((s[i] - '0' + 9)%10 + '0');
		} else {
			ret += s[i];
		}
	}
	return ret;
}
string m(string s){
	//decrements
	string ret;
	for(int unsigned i = 0;i<s.size();i++){
		if(isdigit(s[i])) {
			ret += (char)((s[i] - '0' + 1)%10 + '0');
		} else {
			ret += s[i];
		}
	}
	return ret;
}

int main(){
	int n;
	cin >> n;
	for(int i=0;i<n;i++){
		string messengers;
		cin >> messengers;
		string message;
		cin >> message;
		for(int i = (signed)messengers.size()-1;i>=0;i--){
			if(messengers[i] == 'J') message=j(message);
			if(messengers[i] == 'C') message=c(message);
			if(messengers[i] == 'E') message=e(message);
			if(messengers[i] == 'A') message=a(message);
			if(messengers[i] == 'P') message=p(message);
			if(messengers[i] == 'M') message=m(message);
		}
		cout << message << endl;
	}
	return 0;
}