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 <bits/stdc++.h>
using namespace std;

#define REP(i,a,b) for(int i=(a);i<(int)(b);i++)
#define rep(i,n) REP(i,0,n)
#define FOR(i,c) for(auto& (i):(c))
#define ALL(x) (x).begin(),(x).end()
#define SZ(x) (int)(x).size()

string J(string s) {
    string t = s.substr(1, SZ(s) - 1);
    t += s[0];
    return t;
}

string C(string s) {
    string t = "";
    t += s[SZ(s)-1];
    t += s.substr(0, SZ(s) - 1);
    return t;
}

string E(string s) {
    int n = s.size();
    string t = "";
    if(n % 2 == 0) {
        t += s.substr(n/2, n/2);
        t += s.substr(0, n/2);
    } else {
        t += s.substr(n/2+1, n/2);
        t += s[n/2];
        t += s.substr(0, n/2);
    }
    return t;
}

string P(string s) {
    FOR(c, s) {
        if(isdigit(c)) {
            if(c == '9') c = '0';
            else c++;
        }
    }
    return s;
}

string M(string s) {
    FOR(c, s) {
        if(isdigit(c)) {
            if(c == '0') c = '9';
            else c--;
        }
    }
    return s;
}

void solve(string order, string msg) {
    reverse(ALL(order));
    FOR(c, order) {
        if(c == 'C') msg = J(msg);
        if(c == 'J') msg = C(msg);
        if(c == 'E') msg = E(msg);
        if(c == 'A') reverse(ALL(msg));
        if(c == 'M') msg = P(msg);
        if(c == 'P') msg = M(msg);
    }
    cout << msg << "\n";
}

int main() {
    int n; cin>>n;
    rep(data,n) {
        string order, msg;
        cin >> order >> msg;
        solve(order, msg);
    }
    return 0;
}

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

using namespace std;

string turn1(string S)
{
	return S.substr(1, S.size() - 1) + S[0];
}

string turn2(string S)
{
	return S[S.size() - 1] + S.substr(0, S.size() - 1);
}

string turn3(string S)
{
	string T;

	if (S.size() % 2 == 1)
	{
		T = S.substr(S.size() / 2 + 1, S.size() / 2) + S[S.size() / 2] + S.substr(0, S.size() / 2);
	}
	else
	{
		T = S.substr(S.size() / 2, S.size() / 2) + S.substr(0, S.size() / 2);
	}

	return T;
}

string turn4(string S)
{
	reverse(S.begin(), S.end());

	return S;
}

string turn5(string S)
{
	for (int i = 0; i < S.size(); i++)
	{
		if (isdigit(S[i]))
		{
			if (S[i] == '9')
			{
				S[i] = '0';
			}
			else
			{
				S[i]++;
			}
		}
	}
}

string turn6(string S)
{
	for (int i = 0; i < S.size(); i++)
	{
		if (isdigit(S[i]))
		{
			if (S[i] == '0')
			{
				S[i] = '9';
			}
			else
			{
				S[i]--;
			}
		}
	}
}

int main()
{
	int n; string S, T;

	cin >> n;

	for (int i = 0; i < n; i++)
	{
		cin >> S >> T;

		for (int i = S.size() - 1; i >= 0; i--)
		{
			switch (S[i])
			{
				case 'C': T = turn1(T); break;
				case 'J': T = turn2(T); break;
				case 'E': T = turn3(T); break;
				case 'A': T = turn4(T); break;
				case 'M': T = turn5(T); break;
				case 'P': T = turn6(T); break;
			}
		}

		cout << T << endl;
	}

	return 0;
}

C++: #include<iostream>
#include<string>
#include<vector>
#include<cstdio>
using namespace std;
int main(){
  int n;
  string x;
  string st;
  cin >>n;
  for(int i=0;i<n;i++){
    cin >> x;
    cin >> st;
    for(int j=x.size()-1;j>=0;j--){
      if(x[j]=='C'){
	char stock;
	stock = st[0];
	st.erase(st.begin());
	st+=stock;
      }
      else if(x[j]=='J'){
	char stock;
	stock = st[st.size()-1];
	//	cout << "p1"<<endl;
	st.erase(st.size()-1);
	//cout <<"p2"<<endl;
	st.insert(st.begin(),stock);
      }
      else if(x[j]=='E'){
	string stock;
	int l=st.size()/2;
	for(int k=0;k<l;k++){
	  stock+=st[k];
	}
	string stock2;
	int od = st.size()%2;
	for(int k=l+od;k<l*2+od;k++){
	  stock2+=st[k];
	}
	char st3;
	if(od==1){st3+=st[l];
	  st=stock2+st3+stock;
	}
	else{
	  st=stock2+stock;
	}
      }
      else if(x[j]=='A'){
	string stock;
	for(int k=0;st.empty()!=true;k++){
	  stock += st[0];
	  st.erase(st.begin());
	}
	//cout << stock <<endl;
	for(int k=stock.size()-1;k>=0;k--){
	  st+=stock[k];
	}
      }
      else if(x[j]=='M'){
	for(int k=0;k<st.size();k++){
	  if(st[k]>='0'&&st[k]<'9'){
	    st[k]++;
	  }
	  else if(st[k]=='9'){
	    st[k]='0';
	  }
	}
      }
      else if(x[j]=='P'){
	for(int k=0;k<st.size();k++){
	  if(st[k]>'0'&&st[k]<='9'){
	    st[k]--;
	  }
	  else if(st[k]=='0'){
	    st[k]='9';
	  }
	}
      }	

      //cout <<"it is "<<x[j]<<endl;
      //cout << st << endl;
    }
    cout << st << endl;
  }
  return 0;
}