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++: 
//http://judge.u-aizu.ac.jp/onlinejudge/description.jsp?id=1240

#include<iostream>
#include<map>
#include<vector>
#include<algorithm>
#include<cmath>
#include<climits>
#include<ctime>
#include<cstring>
#include<numeric>

#define ALL(v) (v).begin(),(v).end()
#define REP(i,p,n) for(int i=p;i<(int)(n);++i)
#define rep(i,n) REP(i,0,n)
#define dump(a) (cerr << #a << "=" << (a) << endl)
#define DUMP(list) cout << "{ "; for(auto nth : list){ cout << nth << " "; } cout << "}" << endl;

using namespace std;

string J(string msg)
{
	int n = msg.length();
	char end = msg[n-1];
	
	//msg.pop_back();
	msg.erase(--msg.end());

	return end + msg;
}

string C(string msg)
{
	char first = msg[0];
	msg.erase(msg.begin(),msg.begin()+1);

	return msg = msg + first;
}

string E(string msg)
{
	int n = msg.length();
	int c = 0;
	if(n % 2 == 1){ c = 1; }	
	rep(i,n/2){
		swap(msg[i], msg[i+(n/2)+c]);
	}
	return msg;
}

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

string P(string msg)
{
	rep(i,msg.length()){
		if(isdigit(msg[i])){
			int num = msg[i] - '0';
			num = num - 1;
			if(num < 0) { num = 9; }
			msg[i] = num + '0';
		}
	}

	return msg;
}

string M(string msg)
{
	rep(i,msg.length()){
		if(isdigit(msg[i])){
			int num = msg[i] - '0';
			num = num + 1;
			if(num > 9) { num = 0; }
			msg[i] = num + '0';
		}
	}

	return msg;
}

string analyze(string msg, char order)
{
	string a_msg;
	if(order == 'J'){
		a_msg = J(msg);
	}
	else if(order == 'C'){
		a_msg = C(msg);
	}
	else if(order == 'E'){
		a_msg = E(msg);
	}
	else if(order == 'A'){
		a_msg = A(msg);
	}
	else if(order == 'P'){
		a_msg = P(msg);
	}
	else if(order == 'M'){
		a_msg = M(msg);
	}
	return a_msg;
}

int main()
{
	int N;
	cin >> N;

	rep(nth,N)
	{
		string order;
		string msg;

		cin >> order >> msg;

		for(int i=order.length(); i>0; --i)
		{
			msg = analyze(msg, order[i-1]);	
		}

		cout << msg << endl;
	}
	return 0;
}

C++: #include<iostream>
#include<string>
using namespace std;
int main(){
	int n;
	string a,b;
	char c[100],d[100];
	cin>>n;
	for(int u=0;u<n;u++){
		cin>>a>>b;
		for(int i=0;i<b.size();i++)
			d[i]=b[i];
		for(int i=a.size()-1;i>=0;i--){
			if(a[i]=='J'){
				for(int i=0;i<b.size()-1;i++)
					c[i+1]=d[i];
				c[0]=d[b.size()-1];
			}
			if(a[i]=='C'){
				for(int i=0;i<b.size()-1;i++)
					c[i]=d[i+1];
				c[b.size()-1]=d[0];
			}
			if(a[i]=='E'){
				for(int i=0;i<b.size();i++){
					if(i<b.size()/2)
						c[i+b.size()-b.size()/2]=d[i];
					else
						c[i-b.size()+b.size()/2]=d[i];
				}
			}
			if(a[i]=='A'){
				for(int i=0;i<b.size();i++)
					c[i]=d[b.size()-1-i];
			}
			if(a[i]=='P'){
				for(int i=0;i<b.size();i++){
					bool check=false;
					if(c[i]>='1'&&c[i]<='9'){
						c[i]=c[i]-1;
						check=true;
					}
					else if(c[i]=='0'){
						c[i]='9';
						check=true;
					}
					if(check==false)
						c[i]=d[i];
				}
			}
			if(a[i]=='M'){
				for(int i=0;i<b.size();i++){
					bool check=false;
					if(c[i]>='0'&&c[i]<='8'){
						c[i]=c[i]+1;
						check=true;
					}
					else if(c[i]=='9'){
						c[i]='0';
						check=true;
					}
					if(check==false)
						c[i]=d[i];
				}
			}
			for(int i=0;i<b.size();i++)
				d[i]=c[i];
		}
		for(int i=0;i<b.size();i++)
			cout<<d[i];
		cout<<endl;
	}
	return 0;
}

C++: #include <iostream>
#include <string>

using namespace std;

main(){
  int n;
  while(cin >> n){
    for(int i=0;i<n;i++){
      string hito;
      string data;
      cin >> hito;
      cin >> data;
      for(int j=hito.size()-1;j>=0;j--){
	//cout << data << endl;
	if(hito[j]=='J'){
	  string tmp=data;
	  data="";
	  data+=tmp[tmp.size()-1];
	  for(int k=0;k<tmp.size()-1;k++){
	    data+=tmp[k];
	  }
	}else if(hito[j]=='C'){
	  string tmp=data;
	  data="";
	  for(int k=1;k<tmp.size();k++){
	    data+=tmp[k];
	  }
	  data+=tmp[0];
	}else if(hito[j]=='E'){
	  string left="", right="";
	  if(data.size()%2==0){
	    for(int k=0;k<data.size()/2;k++){
	      left+=data[k];
	      right+=data[k+data.size()/2];
	    }
	  }else{
	    for(int k=0;k<data.size()/2;k++){
	      left+=data[k];
	      right+=data[k+data.size()/2+1];
	    }
	    right+=data[data.size()/2];
	  }
	  data="";
	  data+=right;
	  data+=left;
	}else if(hito[j]=='A'){
	   string tmp=data;
	  for(int k=0;k<tmp.size();k++){
	    data[k]=tmp[tmp.size()-1-k];
	  }
	}else if(hito[j]=='P'){
	  for(int k=0;k<data.size();k++){
	    if(data[k]>='0' && data[k]<='9'){
	      if(data[k]=='0') data[k]='9';
	      else data[k]=data[k]-1;
	    }
	  }
	}else if(hito[j]=='M'){
	  for(int k=0;k<data.size();k++){
	    if(data[k]>='0' && data[k]<='9'){
	      if(data[k]=='9') data[k]='0';
	      else data[k]=data[k]+1;
	    }
	  }
	}
      }
      cout << data << endl;
    }
  }
  return 0;
}