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 <cstring>
#include <string>
#include <algorithm>

using namespace std;

int main(){
    int n;
    cin >> n;

    for(int i=0;i<n;++i){
        string m;
        string pat;

        cin >> m >> pat;
        reverse(m.begin(), m.end());
        int sz = pat.size();
        for(int j=0;j<m.size();j++){
            if(m[j] == 'A'){
                reverse(pat.begin(), pat.end());
            }else if(m[j] == 'M'){
                for(int k=0;k<pat.size();++k){
                    if(pat[k] == '9'){
                        pat[k] = '0';
                    }else if('0' <= pat[k] && pat[k] <= '8'){
                        pat[k]++;
                    }
                }
            }else if(m[j] == 'P'){
                for(int k=0;k<pat.size();++k){
                    if(pat[k] == '0'){
                        pat[k] = '9';
                    }else if('1' <= pat[k] && pat[k] <= '9'){
                        pat[k]--;
                    }
                }
            }else if(m[j] == 'C'){
                pat += pat[0];
                pat = pat.substr(1,sz);
            }else if(m[j] == 'J'){
                string tmp = "";
                tmp += pat[sz-1];
                tmp += pat.substr(0,sz-1);
                pat = tmp;
            }else if(m[j] == 'E'){
                string pre="",suf="", mid="";
                for(int k=0;k<sz/2;++k){
                    pre += pat[k];
                }
                if(sz % 2 == 1){
                    mid += pat[sz/2];
                }
                for(int k=(sz+1)/2;k<sz;++k){
                    suf += pat[k];
                }
                pat = suf + mid + pre;
            }
        }
        cout << pat << endl;
    }
}

C++: #include <iostream>
#include <vector>
#include <cstring>
#include <string>
#include <algorithm>
#include <iomanip>
#include <cmath>
#include <cassert>
using namespace std;

string J(string s) {
	return  s.back() + s.substr(0, s.size() - 1);
}

string C(string s) {
	return  s.substr(1, s.size() - 1) + s.front();
}

string E(string s) {
	string ret;
	if(s.size() % 2) {
		for(int i = s.size() / 2 + 1; i < s.size(); i++) {
			ret += s[i];
		}
		ret += s[s.size() / 2];
		for(int i = 0; i < s.size() / 2; i++) {
			ret += s[i];
		}
	}
	else {
		for(int i = s.size() / 2; i < s.size(); i++) {
			ret += s[i];
		}
		for(int i = 0; i < s.size() / 2; i++) {
			ret += s[i];
		}
	}
	return ret;
}

string A(string s) {
	reverse(s.begin(), s.end());
	return s;
}

string P(string s) {
	for(int i = 0; i < s.size(); i++) {
		if(!isalpha(s[i])) {
			s[i] = '0' + (s[i] - '0' + 9) % 10;
		}
	}
	return s;
}

string M(string s) {
	for(int i = 0; i < s.size(); i++) {
		if(!isalpha(s[i])) {
			s[i] = '0' + (s[i] - '0' + 1) % 10;
		}
	}
	return s;
}

int main() {
	cin.tie(0);
	ios::sync_with_stdio(false);
	int n;
	cin >> n;
	for(int loop = 0; loop < n; loop++) {
		string s, t;
		cin >> s >> t;
		for(int i = s.size() - 1; i >= 0; i--) {
			char c = s[i];
			if(c == 'J') t = J(t);
			if(c == 'C') t = C(t);
			if(c == 'E') t = E(t);
			if(c == 'A') t = A(t);
			if(c == 'P') t = P(t);
			if(c == 'M') t = M(t);
		}

		cout << t << endl;
	}
}