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<cctype>
#include<string>
#include<iostream>
#include<algorithm>

using namespace std;

int main(){
	int n;	cin>>n;
	while(n--){
		string s,m;	cin>>s>>m;
		int len=m.length();
		for(int i=s.length()-1;i>=0;i--){
			if     (s[i]=='J')	rotate(m.begin(),m.begin()+len-1,m.end());
			else if(s[i]=='C')	rotate(m.begin(),m.begin()+1,m.end());
			else if(s[i]=='E'){
				if(len%2==0)	m=m.substr(len/2)+m.substr(0,len/2);
				else			m=m.substr(len/2+1)+m[len/2]+m.substr(0,len/2);
			}
			else if(s[i]=='A')	reverse(m.begin(),m.end());
			else if(s[i]=='P'){
				for(int j=0;j<len;j++){
					if(isdigit(m[j]))	m[j]=(m[j]-'0'+9)%10+'0';
				}
			}
			else if(s[i]=='M'){
				for(int j=0;j<len;j++){
					if(isdigit(m[j]))	m[j]=(m[j]-'0'+1)%10+'0';
				}
			}
		}
		cout<<"@ "<<m<<endl;
	}

	return 0;
}

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

void solve() {
	string order, message;
	cin >> order >> message;
	for (int i = order.size() - 1; i >= 0; i--) {
		int l;
		switch (order[i]) {
		case 'J':
			message = (*message.rbegin()) + message.substr(0, message.size() - 1);
			break;
		case 'C':
			message = message.substr(1) + message[0];
			break;
		case 'E':
			l = message.size() / 2;
			if (message.size() & 1) {
				message = message.substr(message.size() - l) + message[l] + message.substr(0, l);
			}
			else {
				message = message.substr(message.size() - l) + message.substr(0, l);
			}
			break;
		case 'A':
			message = string(message.rbegin(), message.rend());
			break;
		case 'P':
			for (unsigned j = 0; j < message.size(); j++) {
				if (isdigit(message[j])) {
					if (message[j] == '0') {
						message[j] = '9';
					}
					else {
						message[j]--;
					}
				}
			}
			break;
		case 'M':
			for (unsigned j = 0; j < message.size(); j++) {
				if (isdigit(message[j])) {
					if (message[j] == '9') {
						message[j] = '0';
					}
					else {
						message[j]++;
					}
				}
			}
			break;
		}
	}
	cout << message << endl;
}

int main () {
	int n;
	cin >> n;
	for (int i = 0; i < n; i++) {
		solve();
	}
	return 0;
}

C++: #include<bits/stdc++.h>
using namespace std;
int main(){
  int n;
  cin>>n;
  while(n--){
    string q,s;
    cin>>q>>s;
    for(int i=0;i<q.size();i++){
      if(q[i]=='C')s=s.substr(1,s.size()-1)+s[0];
      if(q[i]=='J')s=s[s.size()-1]+s.substr(0,s.size()-1);
      if(q[i]=='E')
	for(int j=0;j<s.size()/2;j++)swap(s[j],s[(s.size()+1)/2+j]);
      if(q[i]=='A')reverse(s.begin(),s.end());
      if(q[i]=='P')
	for(int j=0;j<s.size();j++)
	  if(isdigit(s[j]))s[j]=((s[j]-'0'+10)-1)%10+'0';
      if(q[i]=='M')
	for(int j=0;j<s.size();j++)
	  if(isdigit(s[j]))s[j]=((s[j]-'0')+1)%10+'0';
    }
    cout<<s<<endl;
  }
  return 0;
}

C++: #include <iostream>
#include <string>
#include <stdio.h>
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++ ){
            switch(p[i]){
                case '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;
                }case '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;
                }case 'E':{
                    string tmp = m.substr( 0, m.length() / 2 );
                    m = m.substr( (m.length() + 1) / 2 );
                    m.append( tmp );
                    break;
                }case 'A':{
                    reverse( m.begin(), m.end() );
                    break;
                }case 'P':{
                    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;
                }case '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;
    }
}