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)
}

Python: def J(string):
    return string[-1] + string[:-1] if len(string) >= 2 else string
     
def C(string):
    return string[1:] + string[0] if len(string) >= 2 else string

def E(string):
    if len(string) == 1:
        return string
        
    if len(string) % 2:
        return string[len(string) // 2 + 1:] + string[len(string) // 2] + string[0:len(string) // 2]
    else:
        return string[len(string) // 2:] + string[0:len(string) // 2]

def A(string):
    return string[::-1]

def M(string):
    new = ''
    for i in string:
        if ord(i) < 57 and ord(i) >= 48:
            new += chr(ord(i) + 1)
        elif ord(i) == 57:
            new += '0'
        else:
            new += i
    return new

def P(string):
    new = ''
    for i in string:
        if ord(i) <= 57 and ord(i) > 48:
            new += chr(ord(i) - 1)
        elif ord(i) == 48:
            new += '9'
        else:
            new += i
    return new


ans = []
for i in range(int(input())):
    to_do = input()
    message = input().strip()
    
    for i in to_do[::-1]:
        if i == 'C':
            message = C(message)
        if i == 'J':
            message = J(message)
        if i == 'E':
            message = E(message)
        if i == 'A':
            message = A(message)
        if i == 'P':
            message = P(message)
        if i == 'M':
            message = M(message)
    ans.append(message)

[print(i) for i in ans]

Python: 
n = int(input())

for i in range(n):
  order = input()[::-1]
  message = input()

  for s in order:
    if s == 'J':
      message = message[len(message) - 1] + message[:len(message) - 1]
    elif s == 'C':
      message = message[1:] + message[0]
    elif s == 'E':
      message = message[(len(message)+1)//2:] + message[len(message)//2:(len(message) + 1)//2] + message[:len(message)//2]
    elif s == 'A':
      message = message[::-1] 
    elif s == 'P':
      temp = ''
      for c in message:
        if c == '0':
          c = '9'
        elif c > '0' and c <= '9':
          c = chr(ord(c) - 1)
        temp += c
      message = temp
    elif s == 'M':
      temp = ''
      for c in message:
        if c == '9':
          c = '0'
        elif c >= '0' and c < '9':
          c = chr(ord(c) + 1)
        temp += c
      message = temp
  print(message)

Python: def decodeJ(s):
    return s[-1] + s[:-1]
def decodeC(s):
    return s[1:] + s[0]
def decodeE(s):
    lenS = len(s)
    return s[lenS//2:] + s[:lenS//2] if lenS % 2 == 0 else s[lenS//2+1:] + s[lenS//2] + s[:lenS//2]
def decodeA(s):
    return s[::-1]
def decodeP(s):
    ret = []
    for i in s:
        try:
            ret.append(str((int(i)-1)%10))
        except:
            ret.append(i)
    return ''.join(ret)
def decodeM(s):
    ret = []
    for i in s:
        try:
            ret.append(str((int(i)+1)%10))
        except:
            ret.append(i)
    return ''.join(ret)

N = int(input())
decode = {'J': decodeJ, 'C': decodeC, 'E': decodeE, 'A': decodeA, 'P': decodeP, 'M': decodeM}
for _ in range(N):
    messengers = input()
    message = input()
    for m in messengers[::-1]:
        message = decode[m](message)
    print(message)