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<stdlib.h>
#include<string.h>
using namespace std;
int main()
{
	int n;
	cin >> n;
	for (int i = 0; i < n; i++)
	{
		char messengers[7];
		char message[26];
		cin >> messengers;
		cin >> message;
		int messengersNum = strlen(messengers);
		int messLen = strlen(message);
		for (int j = messengersNum - 1; j >= 0; j--)
		{
			char c = messengers[j];
			if (c == 'J')
			{
				char tmp = message[messLen - 1];
				for (int k = messLen - 1; k - 1 >= 0; k--)
				{
					message[k] = message[k - 1];
				}
				message[0] = tmp;
			}
			else if (c == 'C')
			{
				char tmp = message[0];
				for (int k = 0; k + 1 < messLen; k++)
				{
					message[k] = message[k + 1];
				}
				message[messLen - 1] = tmp;
			}
			else if (c == 'E')
			{
				if (messLen % 2 == 0)
				{
					int range = messLen / 2;
					for (int k = 0; k + range< messLen; k++)
					{
						char tmp = message[k];
						message[k] = message[k + range];
						message[k + range] = tmp;
					}
				}
				else
				{
					int range = messLen / 2 + 1;
					for (int k = 0; k  + range < messLen; k++)
					{
						char tmp = message[k];
						message[k] = message[k + range];
						message[k + range] = tmp;
					}
				}
			}
			else if (c == 'A')
			{
				for (int k = 0; k < messLen - k; k++)
				{
					char tmp = message[k];
					message[k] = message[messLen - 1 - k];
					message[messLen - 1 - k] = tmp;
				}
			}
			else if (c == 'P')
			{
				for (int k = 0; k< messLen; k++)
				{
					if (message[k] >= '0' && message[k] <= '9')
					{
						message[k]--;
						if (message[k] < '0')
						{
							message[k] = '9';
						}
					}
				}
			}
			else if (c == 'M')
			{
				for (int k = 0; k< messLen; k++)
				{
					if (message[k] >= '0' && message[k] <= '9')
					{
						message[k]++;
						if (message[k] > '9')
						{
							message[k] = '0';
						}
					}
				}
			}
		}

		cout << message << endl;
	}
	return 0;
}

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;
    }
}