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<cmath>
#include<queue>
#include<vector>
#include<functional>
#include<algorithm>
using namespace std;
int main() {
	int n;
	cin >> n;
	for (int z = 0; z < n; z++) {
		string a, b;
		cin >> a >> b;
		for (int i = a.length() - 1; i >= 0; i--) {
			string c = "";
			if (a[i] == 'C') {
				for (int i = 1; i < b.length(); i++) c += b[i];
				c += b[0];
				b = c;
			}
			if (a[i] == 'J') {
				c += b[b.length() - 1];
				for (int i = 0; i < b.length() - 1; i++) c += b[i];
				b = c;
			}
			if (a[i] == 'E') {
				int d = floor(b.length() / 2.0);
				string e = "", f = "", g = "";
				int h;
				if (b.length() % 2 == 0) h = b.length()/ 2;
				else h = d+1;
				for (int i = 0; i < d; i++) {
					e += b[i];
				}
				if(b.length()%2!=0)f = b[d];
				for (int i = h; i < b.length(); i++) {
					g += b[i];
				}
				c += g += f += e;
				b = c;
			}
			if (a[i] == 'A') {
				for (int i = b.length() - 1; i >= 0; i--) c += b[i];
				b = c;
			}
			if (a[i] == 'M') {
				for (int i = 0; i < b.length(); i++) {
					if (b[i] >= '0'&&b[i] <= '8') {
						int e = (int)b[i] - '0';
						e++;
						b[i] = (char)e + '0';
					}
					else if (b[i] == '9') {
						b[i] = '0';
					}
				}
			}
			if (a[i] == 'P') {
				for (int i = 0; i < b.length(); i++) {
					if (b[i] >= '1'&&b[i] <= '9') {
						int e = (int)b[i] - '0';
						e--;
						b[i] = (char)e + '0';
					}
					else if (b[i] == '0') {
						b[i] = '9';
					}
				}
			}
		}
		cout << b << endl;
	}
}

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

int main() {
    int n;
    cin >> n;
    for(int i=0; i<n; ++i) {
        string order, message;
        cin >> order >> message;
        reverse(order.begin(), order.end());

        for(int j=0; j<order.size(); ++j) {
            if(order[j] == 'J') {
                message = message.substr(message.size()-1, 1) + message.substr(0, message.size()-1);
            } else if(order[j] == 'C') {
                message = message.substr(1, message.size()-1) + message.substr(0, 1);
            } else if(order[j] == 'E') {
                string left = message.substr(0, message.size()/2);
                string right = message.substr((message.size()+1)/2, message.size()/2);
                if(message.size()%2 == 0) {
                    message = right + left;
                } else {
                    string mid = message.substr(message.size()/2, 1);
                    message = right + mid + left;
                }
            } else if(order[j] == 'A') {
                reverse(message.begin(), message.end());
            } else if(order[j] == 'P') {
                for(int k=0; k<message.size(); ++k) {
                    char c = message[k];
                    if('0' <= c && c <= '9') {
                        message[k] = '0' + (c-'0'+9)%10;
                    }
                }
            } else if(order[j] == 'M') {
                for(int k=0; k<message.size(); ++k) {
                    char c = message[k];
                    if('0' <= c && c <= '9') {
                        message[k] = '0' + (c-'0'+1)%10;
                    }
                }
            }
        }
        cout << message << endl;
    }
}

C++: //????¨???????????????????????????????????????????.
//????????????????????????????????°??????.
#include <iostream>
#include <string>
#include <algorithm>
using namespace std;

int n;
string people;
string result;

string rshift(string s) {
	string ret;
	ret += s[s.length() - 1];
	for (int i = 0; i < s.length() - 1; i++) ret += s[i];
	return ret;
}

string lshift(string s) {
	string ret;
	for (int i = 1; i < s.length(); i++) ret += s[i];
	ret += s[0];
	return ret;
}

string swaplr(string s) {
	string pre, suf;
	for (int i = 0; i < s.length() / 2; i++) pre += s[i];
	for (int i = 0; i < s.length() - s.length() / 2; i++) suf += s[s.length() / 2 + i];
	return suf + pre;
}

string reverse(string s) {
	int l = 0, r = s.length() - 1;
	while (l < r) {
		swap(s[l], s[r]);
		l++;
		r--;
	}
	return s;
}

string decrements(string s) {
	for (int i = 0; i < s.length(); i++) {
		if ('0' <= s[i] && s[i] <= '9') {
			if (s[i] == '0') s[i] = '9';
			else s[i]--;
		}
	}
	return s;
}

string increments(string s) {
	for (int i = 0; i < s.length(); i++) {
		if ('0' <= s[i] && s[i] <= '9') {
			if (s[i] == '9') s[i] = '0';
			else s[i]++;
		}
	}
	return s;
}

int main() {
	cin >> n;
	for (int i = 0; i < n; i++) {
		cin >> people >> result;
		for (int j = people.length() - 1; j >= 0; j--) {
			char c = people[j];
			if (c == 'J') result = rshift(result);
			if (c == 'C') result = lshift(result);
			if (c == 'E') result = swaplr(result);
			if (c == 'A') result = reverse(result);
			if (c == 'P') result = decrements(result);
			if (c == 'M') result = increments(result);
		}
		cout << result << endl;
	}
	return 0;
}