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>
#include <algorithm>
using namespace std;

string s;
string m;

void C() {
    rotate(s.begin(), s.begin()+1, s.end());
}

void J() {
    rotate(s.begin(), s.end()-1, s.end());
}

void E() {
    string p, q;
    if (s.size() % 2 == 1) {
        char mid = s[s.size()/2];
        for (int i = 0; i < s.size()/2; i++) p.push_back(s[i]);
        for (int i = s.size()/2+1; i < s.size(); i++) q.push_back(s[i]);
        s = q + mid + p;
    } else {
        for (int i = 0; i < s.size()/2; i++) p.push_back(s[i]);
        for (int i = s.size()/2; i < s.size(); i++) q.push_back(s[i]);
        s = q + p;
    }
}

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

void P() {
    for (int i = 0; i < s.size(); i++) {
        if (isdigit(s[i])) {
            if (s[i] == '0') {
                s[i] = '9';
            } else {
                s[i]--;
            }
        }
    }
}

void M() {
    for (int i = 0; i < s.size(); i++) {
        if (isdigit(s[i])) {
            if (s[i] == '9') {
                s[i] = '0';
            } else {
                s[i]++;
            }
        }
    }
}

void F() {
    for (int i = 0; i < m.size(); i++) {
        switch (m[i]) {
            case 'J':
                J();
                break;
            case 'C':
                C();
                break;
            case 'E':
                E();
                break;
            case 'A':
                A();
                break;
            case 'P':
                P();
                break;
            case 'M':
                M();
                break;
            default:
                cerr << "ERROR" << endl;
        }
    }
}

int main() {
    int n; cin >> n;
    for (int i = 0; i < n; i++) {
        cin >> m;
        reverse(m.begin(), m.end());
        cin >> s;
        F();
        cout << s << endl;
    }
    return 0;
}

C++: #include<iostream>
#include<cstdio>
#include<vector>
#include<string>
#include<functional>
#include<queue>
#include<algorithm>
#include<complex>
#include<cstdlib>
#include<cctype>

#define REP(i,n) for(int i = 0;i < (n);i++)
#define PB push_back
#define MP make_pair
#define FI first
#define SE second
#define SHOW1d(v,n) {for(int i = 0;i < (n);i++)cout << v[i] << ' ';cout << endl << endl;}
#define SHOW2d(v,i,j) {for(int a = 0;a < i;a++){for(int b = 0;b < j;b++)cout << v[a][b] << ' ';cout << endl;}cout << endl;}
#define ALL(v) v.begin(),v.end()
#define DBG cout << '!' << endl;


using namespace std;

typedef long long ll;
typedef vector<int> iv;
typedef vector<iv> iiv;
typedef vector<string> sv;

string j(string str)
{
	
	string ret = "";
	ret.PB(str[str.size()-1]);
	REP(i,str.size()-1)
	{
		ret.PB(str[i]);
	}
	
	return ret;
	
}

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

string e(string str)
{
	int len = str.size()/2;
	//cout << len << endl;
	string tmp1 = str.substr(0,len);
	string tmp2 = str.substr(str.size()-len,str.size());
	string ret = "";
	ret += tmp2;
	if(len%2 == 1)
	{
		ret += str[len];
	}
	ret += tmp1;
	
	return ret;
}

string a(string str)
{
	reverse(ALL(str));
	
	return str;
}

string p(string str)
{
	REP(i,str.size())
	{
		 if(isdigit(str[i]))
		 {
			 if(str[i] == '0')
				 str[i] = '9';
			 else
				 str[i]--;
		 }
	}
	
	return str;
}

string m(string str)
{
		REP(i,str.size())
	{
		 if(isdigit(str[i]))
		 {
			 if(str[i] == '9')
				 str[i] = '0';
			 else
				 str[i]++;
		 }
	}
	
	return str;

}

int main()
{
	
	int n;
	cin >> n;
	
	REP(aaa,n)
	{
		string messenger,str;
		cin >> messenger >> str;
		
		for(int i = messenger.size()-1;i >= 0;i--)
		{
			switch(messenger[i])
			{
				case 'J':str = j(str);break;
				case 'C':str = c(str);break;
				case 'E':str = e(str);break;
				case 'A':str = a(str);break;
				case 'P':str = p(str);break;
				case 'M':str = m(str);break;
			}
		}
		
		cout << str << endl;
		
	}
	
	return 0;
}