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 <string>

using std::cin;
using std::cout;
using std::endl;
using std::string;

bool is_number(char c) {
	if (c >= '0' && c <= '9') {
		return true;
	}
	return false;
}

string operate_J(string str) {
	string ret = "";
	for (int i = 0; i < str.length()-1; i++) {
		ret += str[i];
	}
	return (str[str.length()-1] + ret);
}

string operate_C(string str) {
	string ret = "";
	for (int i = 1; i < str.length(); i++) {
		ret += str[i];
	}
	return (ret + str[0]);
}

string operate_E(string str) {
	string sub1 = "";
	string sub2 = "";
	int l = str.length();
	int div = l/2;


	if (l%2 == 0) {
		for (int i = 0; i < div; i++) {
			sub1 += str[i];
			sub2 += str[div+i];
		}
		return (sub2 + sub1);
	}
	else {
		for (int i = 0; i < div; i++) {
			sub1 += str[i];
			sub2 += str[div+i+1];
		}
		return (sub2 + str[div] + sub1);
	}
}

string operate_A(string str) {
	string ret = "";
	int l = str.length();
	for (int i = 0; i < l; i++) {
		ret += str[l-i-1];
	}
	return ret;
}

string operate_P(string str) {
	string ret = "";
	for (int i = 0; i < str.length(); i++) {
		if (is_number(str[i])) {
			if (str[i] == '0') {
				ret += "9";
			}
			else {
				ret += str[i]-1;
			}
		}
		else {
			ret += str[i];
		}
	}
	return ret;
}

string operate_M(string str) {
	string ret = "";
	for (int i = 0; i < str.length(); i++) {
		if (is_number(str[i])) {
			if (str[i] == '9') {
				ret += "0";
			}
			else {
				ret += str[i]+1;
			}
		}
		else {
			ret += str[i];
		}
	}
	return ret;
}

string trans_str(string str, char ope) {
	if (ope == 'J') {
		return operate_J(str);
	}
	if (ope == 'C') {
		return operate_C(str);
	}
	if (ope == 'E') {
		return operate_E(str);
	}
	if (ope == 'A') {
		return operate_A(str);
	}
	if (ope == 'P') {
		return operate_P(str);
	}
	if (ope == 'M') {
		return operate_M(str);
	}
	return str;
}

int main(void) {
	int n;
	cin >> n;
	for (int t = 0; t < n; t++) {
		string ope,str;
		cin >> ope;
		cin >> str;
		string ret = str;
		int l = ope.length();

		for (int i = 0; i < l; i++) {
			ret = trans_str(ret, ope[l-i-1]);
		}

		cout << ret << endl;
	}
	return 0;
}

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

void deTransform(const char op, string& str) {
    switch (op) {
    case 'J':
        str = str.at(str.length() - 1) + str.substr(0, str.length() - 1);
        break;
    case 'C':
        str = str.substr(1, str.length() - 1) + str.at(0);
        break;
    case 'E':
        if (str.length() % 2 == 0) {
            str = str.substr(str.length() / 2, str.length() / 2) + str.substr(0, str.length() / 2);
        } else {
            unsigned int middle = str.length() / 2;
            str = str.substr(middle + 1, middle) + str.at(middle) + str.substr(0, middle);
        }
        break;
    case 'A':
        reverse(str.begin(), str.end());
        break;
    case 'P':
        for (string::iterator it = str.begin(); it != str.end(); it++) {
            if (*it == '0') {
                *it = '9';
            } else if ('0' < *it && *it <= '9') {
                (*it)--;
            }
        }
        break;
    case 'M':
        for (string::iterator it = str.begin(); it != str.end(); it++) {
            if (*it == '9') {
                *it = '0';
            } else if ('0' <= *it && *it < '9') {
                (*it)++;
            }
        }
        break;
    }
}

int main() {
    int n;
    cin >> n;
    while (n--) {
        string messengers, message;
        cin >> messengers >> message;
        for (string::reverse_iterator rit = messengers.rbegin(); rit != messengers.rend(); rit++) {
            deTransform(*rit, message);
        }
        cout << message << endl;
    }
}