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 <iomanip>
#include <sstream>
#include <cstdio>
#include <cstdlib>
#include <cstring>
#include <cmath>
#include <climits>
#include <cfloat>
#include <vector>
#include <string>
#include <stack>
#include <queue>
#include <set>
#include <map>
#include <algorithm>
#include <functional>
#include <utility>
#include <numeric>
#include <iterator>

using namespace std;

typedef long long LL;
typedef unsigned long long ULL;
typedef vector<int> VI;
typedef vector<VI> VVI;
typedef vector<string> VS;
typedef pair<int,int> PII;
typedef istringstream ISS;
typedef ostringstream OSS;

#define REP( i, m, n ) for ( int i = (int)( m ); i < (int)( n ); ++i )
#define FOR( v, c ) for ( auto &v : c )

#define EACH( it, c ) for ( auto it = c.begin(); it != c.end(); ++it )
#define ALL( c ) (c).begin(), (c).end()
#define DRANGE( c, p ) (c).begin(), (c).begin() + p, (c).end()

#define PB( n ) push_back( n )
#define MP( a, b ) make_pair( ( a ), ( b ) )
#define EXIST( c, e ) ( (c).find( e ) != (c).end() )

#define fst first
#define snd second

#define DUMP( x ) cerr << #x << " = " << ( x ) << endl
#define DEBUG( x ) cerr << __FILE__ << ":" << __LINE__ << ": " << #x << " = " << ( x ) << endl

string func_j( string msg )
{
	rotate( DRANGE( msg, msg.size() - 1 ) );
	return msg;
}

string func_c( string msg )
{
	rotate( DRANGE( msg, 1 ) );
	return msg;
}

string func_e( string msg )
{
	const int L = msg.size();
	const int mid = L / 2;
	string left = msg.substr( 0, mid );
	string right = msg.substr( L % 2 ? mid + 1 : mid );
	return right + ( L % 2 ? string( 1, msg[ mid ] ) : "" ) + left;
}

string func_a( string msg )
{
	reverse( ALL( msg ) );
	return msg;
}

string func_p( string msg )
{
	REP( i, 0, msg.size() )
	{
		if ( isdigit( msg[i] ) )
		{
			msg[i] = ( ( msg[i] - '0' ) + 10 - 1 ) % 10 + '0';
		}
	}
	return msg;
}

string func_m( string msg )
{
	REP( i, 0, msg.size() )
	{
		if ( isdigit( msg[i] ) )
		{
			msg[i] = ( ( msg[i] - '0' ) + 1 ) % 10 + '0';
		}
	}
	return msg;
}

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

	map< char, string (*)( string ) > funcs;
	funcs[ 'J' ] = func_j;
	funcs[ 'C' ] = func_c;
	funcs[ 'E' ] = func_e;
	funcs[ 'A' ] = func_a;
	funcs[ 'P' ] = func_p;
	funcs[ 'M' ] = func_m;

	int n;
	cin >> n;

	REP( case_num, 0, n )
	{
		string order, message;
		cin >> order >> message;

		for ( int i = order.size() - 1; 0 <= i; i-- )
		{
			message = funcs[ order[i] ]( message );
		}

		cout << message << endl;
	}

	return 0;
}

C++: #include<iostream>
#include<algorithm>
#include<string>
using namespace std;
string decC(string s)
{
	string mess=s;
	mess[s.size()-1]=s[0];
	for(int i = 0; i < s.size()-1; ++i)
	{
		mess[i]=s[i+1];
	}
	return mess;
}

string decJ(string s)
{
	string mess=s;
	mess[0]=s[s.size()-1];
	for(int i = 1; i < s.size(); ++i)
	{
		mess[i]=s[i-1];
	}
	return mess;
}

string decE(string s)
{
	int n=s.size();
	string l=s.substr(0,n/2);
	string m=n%2==0?"":s.substr(n/2,1);
	string r=n%2==0?s.substr(n/2):s.substr(n/2+1);

	return r+m+l;
}

string decP(string s)
{
	for(int i = 0; i < s.size(); ++i)
	{
		if('0'<=s[i]&&s[i]<='9')
		{
			if(s[i]=='0') s[i]='9';
			else s[i]-=1;
		}
	}
	return s;
}

string decM(string s)
{
	for(int i = 0; i < s.size(); ++i)
	{
		if('0'<=s[i]&&s[i]<='9')
		{
			if(s[i]=='9') s[i]='0';
			else s[i]+=1;
		}
	}
	return s;
}

int main()
{
	int n; cin>>n;
	while(n--) 
	{
		string order,mess; cin>>order>>mess;

		for(int i = order.size()-1; 0 <= i; --i)
		{
			if(order[i]=='J') mess=decJ(mess);
			if(order[i]=='C') mess=decC(mess);
			if(order[i]=='E') mess=decE(mess);
			if(order[i]=='A') reverse(mess.begin(),mess.end());
			if(order[i]=='P') mess=decP(mess);
			if(order[i]=='M') mess=decM(mess);
		}
		cout<<mess<<endl;
	}
  return 0;
}