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 <algorithm>
#include <cctype>
#include <cstdlib>
#include <iostream>
#include <string>
using namespace std;

int main() {
	cin.tie(0);
	ios::sync_with_stdio(false);

	int n;
	cin >> n;

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

		const int l = message.size();
		for(int i = ope.size() - 1; i >= 0; --i) {
			switch(ope[i]) {
			case 'A':
				reverse(message.begin(), message.end());
				break;
			case 'C':
				rotate(message.begin(), message.begin() + 1, message.end());
				break;
			case 'E':
				message = message.substr((l + 1) / 2)
					+ (l & 1 ? string(1, message[l / 2]) : "")
					+ message.substr(0, l / 2);
				break;
			case 'J':
				rotate(message.begin(), message.begin() + l - 1, message.end());
				break;
			case 'M':
				for(int j = 0; j < (int)message.size(); ++j)
					if(isdigit(message[j]))
						message[j] = (message[j] - '0' + 1) % 10 + '0';
				break;
			case 'P':
				for(int j = 0; j < (int)message.size(); ++j)
					if(isdigit(message[j]))
						message[j] = (message[j] - '0' + 10 - 1) % 10 + '0';
			}
		}

		cout << message << endl;
	}

	return EXIT_SUCCESS;
}

C++: #include <bits/stdc++.h>
#include <stdint.h>

typedef uint32_t u32;
typedef uint64_t u64;

void revj(std::string& str) {
  std::string temp;
  temp += str[str.size() - 1];
  for(int i = 0; i < (int)str.size() - 1; ++i) {
    temp += str[i];
  }
  str = temp;
}

void revc(std::string& str) {
  std::string temp;
  for(int i = 1; i < (int)str.size(); ++i) {
    temp += str[i];
  }
  temp += str[0];
  str = temp;
}

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

void reva(std::string& str) {
  std::reverse(str.begin(), str.end());
}

void revp(std::string& str) {
  for(int i = 0; i < (int)str.size(); ++i) {
    if( '0' <= str[i] and str[i] <= '9' ) {
      str[i] = (str[i] - '0' + 10 - 1) % 10 + '0';
    }
  }
}

void revm(std::string& str) {
  for(int i = 0; i < (int)str.size(); ++i) {
    if( '0' <= str[i] and str[i] <= '9' ) {
      str[i] = (str[i] - '0' + 1) % 10 + '0';
    }
  }
}

int main() {

  int n;
  std::cin >> n;
  for(int i = 0; i < n; ++i) {
    std::string order;
    std::cin >> order;
    std::string message;
    std::cin >> message;
    for(int j = (int)order.size(); j >= 0; --j) {
      switch( order[j] ) {
      case 'J' :
        revj(message);
        break;
      case 'C' :
        revc(message);
        break;
      case 'E' :
        reve(message);
        break;
      case 'A' :
        reva(message);
        break;
      case 'P' :
        revp(message);
        break;
      case 'M' :
        revm(message);
        break;
      }
    }
    std::cout << message << std::endl;
  }
   
  return 0;
}

C++: #include <bits/stdc++.h>
using namespace std;
int main(){
	int n;
	cin>>n;
	while(n--){
		string s,ss;
		cin>>s>>ss;
		for(int i=s.size()-1;i>=0;i--){
			if(s[i]=='P')
				for(int j=0;j<ss.size();j++)
					if(ss[j]>='0'&&ss[j]<='9')
						ss[j]=(ss[j]-'0'+9)%10+'0';
			if(s[i]=='M')
				for(int j=0;j<ss.size();j++)
					if(ss[j]>='0'&&ss[j]<='9')
						ss[j]=(ss[j]-'0'+1)%10+'0';
			if(s[i]=='A')reverse(ss.begin(),ss.end());
			if(s[i]=='P')for(int k=0;k<ss.size()/2;k++)swap(ss[k],ss[k+(ss.size()+1)/2]);
			if(s[i]=='J')ss=ss[ss.size()-1]+ss.substr(0,s.size()-1);
			if(s[i]=='C')ss=ss.substr(1,s.size()-1)+s[0];
		}
		cout<<ss<<endl;
	}
}

C++: #include<iostream>
#include<vector>
#include<algorithm>
#include<string>
#include<math.h>

using namespace std;
 
string YA(string ans);
string YJ(string ans);
string YC(string ans);
string YE(string ans);
string YP(string ans);
string YM(string ans);


int main(){

	int n;
	string R;
	string ans;

	cin>>n;
	for(int I=0;I<n;I++){

	cin>>R;
	cin>>ans;

	for(int i=R.size()-1;i>=0;i--){
		if(R[i]=='A')ans=YA(ans);
		if(R[i]=='J')ans=YJ(ans);
		if(R[i]=='C')ans=YC(ans);
		if(R[i]=='E')ans=YE(ans);
		if(R[i]=='P')ans=YP(ans);
		if(R[i]=='M')ans=YM(ans);
	}

	cout<<ans<<endl;
	}
	return 0;
}

string YA(string ans){
	string t=ans;
	int x=ans.size()-1;
	for(int i=0;i<ans.size();i++)
		ans[i]=t[x-i];

	return ans;
}
string YC(string ans){
	string t=ans;
	int x=ans.size()-1;
	for(int i=0;i<ans.size()-1;i++)
		ans[i]=t[i+1];
	ans[x]=t[0];
	return ans;
}
string YJ(string ans){
	string t=ans;
	int x=ans.size()-1;
	for(int i=0;i<ans.size()-1;i++)
		ans[i+1]=t[i];
	ans[0]=t[x];
	return ans;
}
string YM(string ans){
	for(int i=0;i<ans.size();i++){
		if(ans[i]>='0'&&ans[i]<'9'){
			ans[i]+=1;
		}
		else if(ans[i]=='9')ans[i]='0';
	}
	return ans;
}
string YP(string ans){
	for(int i=0;i<ans.size();i++){
		if(ans[i]>'0'&&ans[i]<='9'){
			ans[i]-=1;
		}
		else if(ans[i]=='0')ans[i]='9';
	}
	return ans;
}
string YE(string ans){
	string t=ans;
	int x=(ans.size())/2;
	int N=x;
	if(ans.size()%2==1)N++;
	for(int i=0;i<x;i++)
		ans[i]=t[N+i];
	
	for(int i=N;i<ans.size();i++) 
	ans[i]=t[i-N];
	//ans=Q+t;
	return ans;
}