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 <cstdio>
#include <string>
#include <vector>
#include <stack>
#include <deque>
#include <queue>
#include <set>
#include <cmath>
#include <algorithm>
#include <map>
#include <list>

using namespace std;

#define FOR( i, k, n ) for ( int i = ( k ); i <= ( int )( n ); ++i )
#define REP( i, n ) FOR( i, 1, n )

typedef long long ll;
typedef pair< int, int > P;

void DecodeJ( string& );
void DecodeC( string& );
void DecodeE( string& );
void DecodeA( string& );
void DecodeP( string& );
void DecodeM( string& );

int main()
{
	int n;  cin >> n;
	while( n-- ) {
		char order[ 7 ];
		stack< char > stc;
		string message;
		cin >> order;
		cin >> message;
		for( int i = 0; order[ i ] != '\0'; ++i ) stc.push( order[ i ] );
		while( !stc.empty() ) {
			char fool = stc.top();  stc.pop();
			switch( fool ) {
			case 'J' : DecodeJ( message ); break;
			case 'C' : DecodeC( message ); break;
			case 'E' : DecodeE( message ); break;
			case 'A' : DecodeA( message ); break;
			case 'P' : DecodeP( message ); break;
			case 'M' : DecodeM( message ); break;
			};
		}
		cout << message << endl;
	}
	return 0;
}

void DecodeJ( string& message ) {
	int size = message.size();
	string tmp;
	tmp += message[ size - 1 ];
	tmp += message.substr( 0, size - 1 );
	message = tmp;
}

void DecodeC( string& message ) {
	int size = message.size();
	string tmp;
	tmp += message.substr( 1, size - 1 );
	tmp += message[ 0 ];
	message = tmp;
}

void DecodeE( string& message ) {
	int size = message.size();
	string tmp;
	if( size % 2 ) {
		tmp += message.substr( size / 2 + 1, size / 2 );
		tmp += message[ size / 2 ];
		tmp += message.substr( 0, size / 2 );
	}
	else {
		tmp += message.substr( size / 2, size / 2 );
		tmp += message.substr( 0, size / 2 );
	}
	message = tmp;
}

void DecodeA( string& message ) {
	string tmp;
	string::reverse_iterator rit = message.rbegin();
	for( ; rit != message.rend(); ++rit ) tmp += *rit;
	message = tmp;
}

void DecodeP( string& message ) {
	string tmp;
	string::iterator it = message.begin();
	for( ; it != message.end(); ++it ) {
		char ch = *it;
		if( ch == '0' ) tmp += '9';
		else if( '1' <= ch && ch <= '9' ) tmp += ( char )( ch - 1 );
		else tmp += ch;
	}
	message = tmp;
}

void DecodeM( string& message ) {
	string tmp;
	string::iterator it = message.begin();
	for( ; it != message.end(); ++it ) {
		char ch = *it;
		if( ch == '9' ) tmp += '0';
		else if( '0' <= ch && ch <= '8' ) tmp += ( char )( ch + 1 );
		else tmp += ch;
	}
	message = tmp;
}

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

vector<char> v;

void C(){
	v.push_back(v[0]);
	v.erase(v.begin());
}

void J(){
	v.insert(v.begin(),v[v.size()-1]);
	v.pop_back();
}

void E(){
	stack<char> st[2];
	for(int i=0;i<v.size()/2;i++){
		st[0].push(v[i]);
		st[1].push(v[v.size()-1-i]);
	}
	for(int i=0;i<v.size()/2;i++){
		v[i]=st[1].top();
		v[v.size()-1-i]=st[0].top();
		st[0].pop(),st[1].pop();
	}
}

void A(){
	stack<char> st;
	for(int i=0;i<v.size();i++)st.push(v[i]);
	for(int i=0;i<v.size();i++){
		v[i]=st.top();
		st.pop();
	}
}

void M(){
	for(int i=0;i<v.size();i++){
		if(v[i]>='0'&&v[i]<='9'){
			v[i]=((v[i]-'0')+1)%10+'0';
		}
	}
}

void P(){
	for(int i=0;i<v.size();i++){
		if(v[i]>='0'&&v[i]<='9'){
			v[i]=((v[i]-'0')+9)%10+'0';
		}
	}
}

int main(){
	int n;
	string s,q;
	cin>>n;
	while(n--){
		cin>>s>>q;
		v.clear();
		for(int i=0;i<q.size();i++)v.push_back(q[i]);
		for(int i=s.size()-1;i>=0;i--){
			if(s[i]=='J')J();
			if(s[i]=='C')C();
			if(s[i]=='E')E();
			if(s[i]=='A')A();
			if(s[i]=='P')P();
			if(s[i]=='M')M();
		}
		for(int i=0;i<v.size();i++)cout<<v[i];
		cout<<endl;
	}
	return 0;
}

C++: #include<bits/stdc++.h>
using namespace std;
int main(){
  int n;
  cin>>n;
  while(n--){
    string q,s;
    cin>>q>>s;
    for(int i=s.size()-1;0<=i;i--){
      if(q[i]=='C')s=s.substr(1,s.size()-1)+s[0];
      if(q[i]=='J')s=s[s.size()-1]+s.substr(0,s.size()-1);
      if(q[i]=='E')
	for(int j=0;j<s.size()/2;j++)swap(s[j],s[(s.size()+1)/2+j]);
      if(q[i]=='A')reverse(s.begin(),s.end());
      if(q[i]=='P')
	for(int j=0;j<s.size();j++)
	  if(isdigit(s[j]))s[j]=((s[j]-'0'+10)-1)%10+'0';
      if(q[i]=='M')
	for(int j=0;j<s.size();j++)
	  if(isdigit(s[j]))s[j]=((s[j]-'0')+1)%10+'0';
    }
    cout<<s<<endl;
  }
  return 0;
}