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<cstdio>
#include<vector>
#include<algorithm>
#include<iostream>
#include<string>
#include<cctype>
using namespace std;
int main(){
    int n;
    cin>>n;
    while(n--){
        string p,s;
        cin>>p>>s;
        reverse(p.begin(),p.end());
        for(int i=0;i<p.length();i++){
            if(p[i]=='C')rotate(s.begin(),s.begin()+1,s.end());
            else if(p[i]=='J')rotate(s.begin(),s.begin()+s.length()-1,s.end());
            else if(p[i]=='E'){
                for(int j=0;j<s.length()/2;j++)swap(s[j],s[j+(s.length()+1)/2]);
            }
            else if(p[i]=='A'){
                reverse(s.begin(),s.end());
            }
            else if(p[i]=='M'){
                for(int i=0;i<s.length();i++){
                    if(!isdigit(s[i]))continue;
                    s[i]=((s[i]-'0')+1)%10+'0';
                }
            }
            else{
                for(int i=0;i<s.length();i++){
                    if(!isdigit(s[i]))continue;
                    s[i]=((s[i]-'0')+9)%10+'0';
                }
            }
        }
        cout<<s<<endl;
    }
    return 0;
}

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 "bits/stdc++.h"
#include<unordered_map>
#include<unordered_set>
#pragma warning(disable:4996)
using namespace std;
using ld = long double;
template<class T>
using Table = vector<vector<T>>;
const ld eps=1e-9;

//// < "D:\D_Download\Visual Studio 2015\Projects\programing_contest_c++\Debug\a.txt"
int main() {
	int N; cin >> N;
	while (N--) {
		string st; cin >> st;
		string aa; cin >> aa;
		for (int i = 0; i < st.size(); ++i) {
			char c = st[st.size() - 1 - i];
			if (c == 'A') {
				reverse(aa.begin(), aa.end());
			}
			else if (c == 'C') {
				rotate(aa.begin(), aa.begin() + 1, aa.end());
			}
			else if (c == 'M') {
				for (auto& ac : aa) {
					if (isdigit(ac))ac = (ac - '0' + 1) % 10 + '0';
				}
			}
			else if (c == 'P') {
				for (auto& ac : aa) {
					if (isdigit(ac))ac = (ac - '0' + 9) % 10 + '0';
				}
			}
			else if (c == 'E') {
				string from = aa.substr(0,aa.size() / 2);
				string to = aa.substr(aa.size()-aa.size() / 2,aa.size() / 2);
				if (aa.size() % 2)aa = to + aa[aa.size() / 2] + from;
				else aa = to + from;
			}
			else if (c == 'J') {

				rotate(aa.begin(), aa.begin() + aa.size()-1, aa.end());
			}
		}
		cout << aa << endl;
	}
	return 0;
}

C++: #include <bits/stdc++.h>
using namespace std;

int n;

int main(){
//	cin.tie(0);
//	ios::sync_with_stdio(false);
	cin >> n;
	for(int i=0; i<n; ++i){
		string s, t;
		cin >> t >> s;
		for(int j=t.size()-1; j>=0; --j){
			if(t[j] == 'J'){
				s = s.substr(s.size()-1, 1) + s.substr(0, s.size()-1);
			}else if(t[j] == 'C'){
				s = s.substr(1, s.size()-1) + s.substr(0, 1);
			}else if(t[j] == 'E'){
				if(s.size() % 2 == 0){
					s = s.substr(s.size()/2, s.size()/2) + s.substr(0, s.size()/2);
				}else{
					s = s.substr(s.size()/2+1, s.size()/2) + s[s.size()/2] + s.substr(0, s.size()/2);
				}
			}else if(t[j] == 'A'){
				reverse(s.begin(), s.end());
			}else if(t[j] == 'P'){
				for(int k=0; k<s.size(); ++k){
					if('1' <= s[k] && s[k] <= '9')
						--s[k];
					else if(s[k] == '0')
						s[k] = '9';
				}
			}else{
				for(int k=0; k<s.size(); ++k){
					if('0' <= s[k] && s[k] <= '8')
						++s[k];
					else if(s[k] == '9')
						s[k] = '0';
				}
			}
		}
		cout << s << "\n";
	}
}