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>
using namespace std;

int main()
{
  int n;
  string s, m;
  cin >> n;
  for(int i = 0; i < n; i++)
  {
    cin >> m >> s;
    for(int j = m.length() - 1; j >= 0; j--)
    {
      switch(m[j])
      {
        case 'C':
          s = s.substr(1, s.length() - 1) + s[0];
          break;
        case 'J':
          s = s[s.length() - 1] + s.substr(0, s.length() - 1);
          break;
        case 'E':
          {
            int a = s.length() / 2, b = s.length() % 2;
            s = s.substr(a + b, a) + (b ? s.substr(a + 1, 1) : "") + s.substr(0, a);
          }
          break;
        case 'A':
          //reverse(s.begin(), s.end());
          break;
        case 'M':
          for(int k = 0; k < s.length(); k++)
            if(s[k] >= '0' && s[k] <= '9')
              s[k] = (s[k] - '0' + 1) % 10 + '0';
          break;
        case 'P':
          for(int k = 0; k < s.length(); k++)
            if(s[k] >= '0' && s[k] <= '9')
              s[k] = (s[k] - '0' - 1) % 10 + '0';
          break;
      }
    }
    cout << s << endl;
  }
}

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

int main(){
    int n;
    cin >> n;
    while( n-- ){
        string p, m;
        cin >> p >> m;
        reverse( p.begin(), p.end() );
        for( size_t i = 0; i < p.length(); i++ ){
            if( p[i] == 'J' ){
                char tmp = m[m.length() - 1];
                for( size_t j = m.length() - 1; j > 0; j-- ){
                    //if( j == 0 ){
                    //}else{
                        m[j] = m[j-1];
                    //}
                    //cout << m[j] << endl;
                }
                m[0] = tmp;
                break;
            }if( p[i] == 'C' ){
                char tmp = m[0];
                for( size_t j = 0; j < m.length(); j++ ){
                    if( j == m.length() - 1 ) m[j] = tmp;
                    else m[j] = m[j+1];
                }
                break;
            }if( p[i] == 'E' ){
                string tmp = m.substr( 0, m.length() / 2 );
                m = m.substr( (m.length() + 1) / 2 );
                m.append( tmp );
                break;
            }if( p[i] == 'A' ){
                reverse( m.begin(), m.end() );
                break;
            }if( p[i] == 'J' ){
                for( size_t j = 0; j < m.length(); j++ ){
                    if( '1' <= m[j] && m[j] <= '9' ){
                        m[j]--;
                    }else if( '0' == m[j] ){
                        m[j] = '9';
                    }
                }
                break;
            }if( p[i] == 'M' ){
                for( size_t j = 0; j < m.length(); j++ ){
                    if( '0' <= m[j] && m[j] <= '8' ){
                        m[j]++;
                    }else if( '9' == m[j] ){
                        m[j] = '0';
                    }
                }
                break;
            }
        }
        cout << m << endl;
    }
}

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

using namespace std;

void inv_A ( string& str )
{
	reverse( str.begin(), str.end() );
}

void inv_C ( string& str )
{
	str = str.substr( 1 ) + str[0];
}

void inv_E ( string& str )
{
	int half = str.size() / 2, offset = ( str.size() + 1 ) / 2;
	for ( int i = 0; i < half; ++i ) {
		swap( str[i], str[i + offset] );
	}
}

void inv_J ( string& str )
{
	str = str[str.size() - 1 ] + str.substr( 0, str.size() - 1 );
}

void inv_M ( string& str )
{
	for ( int i = 0; i < str.size(); ++i ) {
		if ( isdigit( str[i] ) ) {
			str[i] = '0' + ( str[i] - '0' + 1 ) % 10;
		}
	}
}

void inv_P ( string& str )
{
	for ( int i = 0; i < str.size(); ++i ) {
		if ( isdigit( str[i] ) ) {
			str[i] = '0' + ( str[i] - '0' + 9 ) % 10;
		}
	}
}

int main ( void )
{
	int n;
	cin >> n;

	while ( n-- ) {
		string order,
			   message;
		cin >> order
			>> message;

		for ( int i = order.size() - 1; i >= 0; --i ) {
			switch ( order[i] ) {
			case 'A':
				inv_A( message );
				break;
			case 'C':
				inv_C( message );
				break;
			case 'E':
				inv_E( message );
				break;
			case 'J':
				inv_J( message );
				break;
			case 'M':
				inv_M( message );
				break;
			case 'P':
				inv_P( message );
				break;
			}
			// cout << i << ' ' << message << endl;
		}
		cout << message << endl;
	}
	return 0;
}