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<vector>
#include<string>
#include<queue>
#include<map>
#include<algorithm>
using namespace std;

#define REP(i,a,b) for(i=a; i<b; ++i)
#define rep(i,n) REP(i,0,n)

string cor(string order,string message) {
  for(int i=order.length()-1; i>=0; --i) {
    //cout<<i<<"  "<<message<<endl;
    if(order[i] == 'A') {
      reverse(message.begin(),message.end());
    }else if(order[i] == 'J') {
      string mes(message.length(), ' ');
      for(int j=0; j<message.length(); ++j) {
	if(j == 0) mes[j] = message[message.length()-1];
	else mes[j] = message[j-1];
      }
      message = mes;
    }else if(order[i] == 'M') {
      for(int j=0; j<message.length(); ++j) {
	if(message[j] >= '0' && message[j] <= '8') message[j]++;
	else if(message[j] == '9') message[j] = '0';
      }
    }else if(order[i] == 'P') {
      for(int j=0; j<message.length(); ++j) {
	if(message[j] == '0') message[j] = '9';
	else if(message[j] >= '1' && message[j] <= '9') message[j]--;
      }
    }else if(order[i] == 'C') {
      string mes(message.length(), ' ');
      char tmp = message[0];
      for(int j=0; j<message.length(); ++j) {
	if(j == message.length()-1) mes[j] = tmp;
	else mes[j] = message[j+1];
      }
      message = mes;
    }else if(order[i] == 'E') {
      string fore = "";
      string back = "";
      for(int j=0; j<message.length()/2; ++j) fore += string(1, message[j]);
      if(message.length()%2 == 0) {
	for(int j=message.length()/2; j<message.length(); ++j)
	  back += string(1, message[j]);
	//cout<<back<<" "<<fore<<" <- "<<message<<endl;
	message = back + fore;
      }else{
	fore = message[message.length()/2] + fore;
	for(int j = message.length()/2+1; j<message.length(); ++j)
	  back += string(1, message[j]);
	//cout<<back<<" "<<fore<<" <- "<<message<<endl;
	message = back + fore;
      }
    }
  }
  return message;
}

int main() {
  int i,j,k,n;
  string order,message;
  cin>>n;
  rep(i,n) {
    cin>>order;
    cin>>message;
    cout<<cor(order,message)<<endl;
  }
}

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

string V,W;
int n;

string J(string S) {
	string T = "";
	T = S[S.size() - 1] + S.substr(0, S.size() - 1);
	return T;
}

string C(string S) {
	string T = "";
	T = S.substr(1, S.size() - 1) + S[0];
	return T;
}

string E(string S) {
	string T = "";
	T += S.substr(S.size() - (S.size() / 2), S.size() / 2);
	if (S.size() % 2 == 1) { S += S[S.size() / 2]; }
	T += S.substr(0, S.size() / 2);
	return T;
}

string A(string S) {
	string T = "";
	for (int k = S.size() - 1; k >= 0; k--) {
		T += S[k];
	}
	return T;
}

string P(string S) {
	string T = "";
	for (int k = 0; k < S.size(); k++) {
		if (isdigit(S[k])) {
			T += (S[k] - 1);
			if (T[k] < '0') {
				T[k] += 10;
			}
		}
		else {
			T += S[k];
		}
	}
	return T;
}

string M(string S) {
	string T = "";
	for (int k = 0; k < S.size(); k++) {
		if (isdigit(S[k])) {
			T += (S[k] + 1);
			if (T[k] > '9') {
				T[k] -= 10;
			}
		}
		else {
			T += S[k];
		}
	}
	return T;
}

string message(string S, string T) {
	for (int j = S.size() - 1; j >= 0; j--) {
		if (S[j] == 'J') {
			T = J(T);
		}
		if (S[j] == 'C') {
			T = C(T);
		}
		if (S[j] == 'E') {
			T = E(T);
		}
		if (S[j] == 'A') {
			T = A(T);
		}
		if (S[j] == 'P') {
			T = P(T);
		}
		if (S[j] == 'M') {
			T = M(T);
		}
	}
	return T;
}

int main() {
	cin >> n;
	for (int i = 0; i < n; i++) {
		cin >> V >> W;
		cout << message(V, W) << endl;
	}
}

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

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