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>
#include<cstring>
#include<cctype>

using namespace std;

string revJ(string t){
ÃÂ ÃÂ string ret = t;
ÃÂ ÃÂ ret.insert(ret.begin(),t[t.length()-1]);
ÃÂ ÃÂ ret.erase(ret.end()-1);
ÃÂ ÃÂ return ret;
}
string revC(string t){
ÃÂ ÃÂ string ret = t;
ÃÂ ÃÂ ret += t[0];
ÃÂ ÃÂ ret.erase(ret.begin());
ÃÂ ÃÂ return ret;
}
string revE(string t){
ÃÂ ÃÂ char c=0;
ÃÂ ÃÂ if(t.length()==1)return t;
ÃÂ ÃÂ if(t.length()%2){
ÃÂ ÃÂ  ÃÂ c = t[t.length()/2];
ÃÂ ÃÂ  ÃÂ t.erase(t.begin()+t.length()/2);
ÃÂ ÃÂ }
ÃÂ ÃÂ string l = t.substr(0,t.length()/2);
ÃÂ ÃÂ string r = t.substr(t.length()/2,t.length()-t.length()/2);
ÃÂ ÃÂ if(c){
ÃÂ ÃÂ  ÃÂ return r+c+l;
ÃÂ ÃÂ }else return r+l;
}
string revA(string t){
ÃÂ ÃÂ string ret = t;
ÃÂ ÃÂ reverse(ret.begin(),ret.end());
ÃÂ ÃÂ return ret;
}
string revP(string t){
ÃÂ ÃÂ //dec
ÃÂ ÃÂ string ret = t;
ÃÂ ÃÂ for(int i = 0; i < (signed)ret.length(); ++i){
ÃÂ ÃÂ  ÃÂ if( isdigit(ret[i]) ){
ÃÂ ÃÂ  ÃÂ  ÃÂ ret[i]--;
ÃÂ ÃÂ  ÃÂ  ÃÂ if(ret[i]<'0')ret[i]='9';
ÃÂ ÃÂ  ÃÂ }
ÃÂ ÃÂ }
ÃÂ ÃÂ return ret;
}
string revM(string t){
ÃÂ ÃÂ //inc
ÃÂ ÃÂ string ret = t;
ÃÂ ÃÂ for(int i = 0; i < (signed)ret.length(); ++i){
ÃÂ ÃÂ  ÃÂ if( isdigit(ret[i]) ){
ÃÂ ÃÂ  ÃÂ  ÃÂ ret[i]++;
ÃÂ ÃÂ  ÃÂ  ÃÂ if(ret[i]>'9')ret[i]='0';
ÃÂ ÃÂ  ÃÂ }
ÃÂ ÃÂ }
ÃÂ ÃÂ return ret;
}

int main()
{
ÃÂ ÃÂ int n;
ÃÂ ÃÂ cin >> n;
ÃÂ ÃÂ for(int i = 0; i < n; ++i){
ÃÂ ÃÂ  ÃÂ string order;
ÃÂ ÃÂ  ÃÂ string msg;
ÃÂ ÃÂ  ÃÂ cin >> order >> msg;
ÃÂ ÃÂ  ÃÂ for(int i = (int)order.length()-1; i>=0; --i){
ÃÂ ÃÂ  ÃÂ  ÃÂ if( order[i] == 'J' ){
	msg = revJ( msg );
ÃÂ ÃÂ  ÃÂ  ÃÂ }
ÃÂ ÃÂ  ÃÂ  ÃÂ if( order[i] == 'C' ){
	msg = revC( msg );
ÃÂ ÃÂ  ÃÂ  ÃÂ }
ÃÂ ÃÂ  ÃÂ  ÃÂ if( order[i] == 'E' ){
	msg = revE( msg );
ÃÂ ÃÂ  ÃÂ  ÃÂ }
ÃÂ ÃÂ  ÃÂ  ÃÂ if( order[i] == 'A' ){
	msg = revA( msg );
ÃÂ ÃÂ  ÃÂ  ÃÂ }
ÃÂ ÃÂ  ÃÂ  ÃÂ if( order[i] == 'P' ){
	msg = revP( msg );
ÃÂ ÃÂ  ÃÂ  ÃÂ }
ÃÂ ÃÂ  ÃÂ  ÃÂ if( order[i] == 'M' ){
	msg = revM( msg );
ÃÂ ÃÂ  ÃÂ  ÃÂ }
ÃÂ ÃÂ  ÃÂ }
ÃÂ ÃÂ  ÃÂ cout << msg << endl;
ÃÂ ÃÂ }
ÃÂ ÃÂ return 0;
}

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

using namespace std;

int main() {
	int N; cin >> N;
	for (int t = 0; t < N; ++t) {
		string s1, s2; cin >> s1 >> s2;
		reverse( s1.begin(), s1.end() );
		for (int i = 0; i < s1.size(); ++i) {
			switch (s1[i]) {
				case 'A':
					reverse( s2.begin(), s2.end() );
					break;

				case 'J':
					s2 = s2[s2.size()-1] + s2.substr(0, s2.size()-1);
					break;

				case 'C':
					s2 = s2.substr(1) + s2[0];
					break;

				case 'E':
					if (s2.size() > 1) {
						if (s2.size() % 2 == 0) s2 = s2.substr(s2.size()/2) + s2.substr(0, s2.size()/2);
						else s2 = s2.substr(s2.size()/2+1) + s2[s2.size()/2] + s2.substr(0, s2.size()/2);
					}
					break;

				case 'M':
					for (int j = 0; j < s2.size(); ++j) {
						if ('0' <= s2[j] && s2[j] < '9') ++s2[j];
						else if (s2[j] == '9') s2[j] = '0';
					}
					break;

				case 'P':
					for (int j = 0; j < s2.size(); ++j) {
						if ('0' < s2[j] && s2[j] <= '9') --s2[j];
						else if (s2[j] == '0') s2[j] = '9';
					}
					break;
			}
		}
		cout << s2 << endl;
	}
}

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

int main(){
  int n;
  cin>>n;
  for(int i=0;i<n;i++){
    char a[7],ans[26],b[26],x=0,y=0;
    scanf("%s",a);
    x=strlen(a);
    scanf("%s",ans);
    y=strlen(ans);  

    for(int j=0;j<y;j++)
      b[j]=ans[j];

    for(int k=x-1;k>=0;k--){
      if(a[k]=='C'){//??????
	b[y-1]=ans[0];
	for(int j=1;j<y;j++) b[j-1]=ans[j];
      }
      else if(a[k]=='J'){//??????
	b[0]=ans[y-1];
	for(int j=0;j<y-1;j++) b[j+1]=ans[j];
      }
      else if(a[k]=='E'){//swap
	if(y%2==0)
	  for(int j=0;j<y/2;j++) 
	    swap(b[j],b[j+(y/2)]);
	else
	  for(int j=0;j<y/2;j++) 
	    swap(b[j],b[j+(y/2)+1]);



      }
      else if(a[k]=='A'){//????????????
	int o=y;
	while(1){
	  if(o==0)break;
	  for(int j=0;j<y;j++){
	    b[j]=ans[o-1];
	    o--;
	  }
	}
      }
      else if(a[k]=='M'){//+1
	for(int j=0;j<y;j++) 
	  if(ans[j]>='0'&&ans[j]<='8') b[j]=ans[j]+1;
	  else if(ans[j]=='9') b[j]=ans[j]-9;
      }
      else if(a[k]=='P')//-1
	for(int j=0;j<y;j++) 
	  if(ans[j]>='1'&&ans[j]<='9') b[j]=ans[j]-1;
	  else if(ans[j]=='0') b[j]=ans[j]+9;

      for(int j=0;j<y;j++)
	ans[j]=b[j];
    }
    for(int j=0;j<y;j++)
      cout<<ans[j];
    cout<<endl;

  }
  return 0;
}