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>
using namespace std;

string translateJ( string k );
string translateC( string k );
string translateE( string k );
string translateA( string k );
string translateM( string k );
string translateP( string k );

int main()
{
    int n;
    string order, key;

    cin >> n;

    for( int i = 0; i < n; i++ )
    {
        cin >> order >> key;
        for( int j = order.size() - 1; j >= 0; j-- )
        {
            if( order[j] == 'J' )
                key = translateJ( key );
            else if( order[j] == 'C' )
                key = translateC( key );
            else if( order[j] == 'E' )
                key = translateE( key );
            else if( order[j] == 'A' )
                key = translateA( key );
            else if( order[j] == 'P' )
                key = translateP( key );
            else
                key = translateM( key );
        }
        cout << key << endl;
    }
    return 0;
}

string translateJ( string k )
{
    char c = k[k.size() - 1];
    for( int i = k.size() - 1; i > 0; i-- )
        k[i] = k[i-1];
    k[0] = c;
    return k;
}

string translateC( string k )
{
    char c = k[0];
    for( int i = 0; i < k.size() - 1; i++ )
        k[i] = k[i+1];
    k[k.size()-1] = c;
    return k;
}

string translateE( string k )
{
    string a = "", b = "";
    int c = k.size();
    if( c % 2 == 0 )
    {
        for( int i = 0; i < c; i++ )
            i < c / 2 ? a += k[i] : b += k[i];
        return b + a;
    }
    else
    {
        for( int i = 0; i < c / 2; i++ )
            a += k[i];
        for( int i = c / 2 + 1; i < c; i++ )
            b += k[i];
        return b + k[c/2] + a;
    }
}

string translateA( string k )
{
    string r = "";
    for( int i = k.size() - 1; i >= 0; i-- )
        r += k[i];
    return r;
}

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

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

C++: #include<iostream>
#include<string>
#include<algorithm>
using namespace std;
int main(){
  int n;
  string c,m;
  cin>>n;
  for(int i=0;i<n;i++){
    cin>>c>>m;
    int size=m.size();
    for(int j=c.size()-1;j>=0;j--){
      if(c[j]=='C'){
        m+=m[0];
        m.erase(m.begin());
      }
      if(c[j]=='J'){
        m=m[size-1]+m;
        m.erase(m.end()-1);
      }
      if(c[j]=='M'){
        for(int k=0;k<size;k++){
          if('0'<=m[k]&&m[k]<='8')m[k]++;
          else if(m[k]=='9')m[k]='0';
        }
      }
      if(c[j]=='P'){
        for(int k=0;k<size;k++){
          if('1'<=m[k]&&m[k]<='9')m[k]--;
          else if(m[k]=='0')m[k]='9';
        }
      }
      if(c[j]=='A')reverse(m.begin(),m.end());
      if(c[j]=='E'){
        if(size%2==0){
          string a;
          for(int k=size/2;k<size;k++)a+=m[k];
          for(int k=0;k<size/2;k++)a+=m[k];
          m=a;
        }else{
          string a;
          for(int k=size/2+1;k<size;k++)a+=m[k];
          a+=m[size/2];
          for(int k=0;k<size/2;k++)a+=m[k];
          m=a;
        }
      }
    }
    cout<<m<<endl;
  }
  return 0;
}