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<cmath>
#include<cstdio>
#include<algorithm>
#include<vector>
#include<cstring>

using namespace std;

#define INF 999999999

string mej(string v){
	return v.substr(v.size()-1) + v.substr(0,v.size()-1);
}
string mec(string v){
	return v.substr(1) + v.substr(0,1);
}
string mee(string v){
	for(int i=0;i<v.size()/2;i++){
		swap(v[i], v[i + (v.size()+1)/2]);
	}
	return v;
}
string mea(string v){
	for(int i=0;i<v.size()/2;i++){
		swap(v[i], v[v.size()-1-i]);
	}
	return v;
}
string mep(string v){
	for(int i=0;i<v.size();i++){
		if(v[i] >= '1' && v[i] <= '9') v[i] -= 1;
		else if(v[i] == '0') v[i] = '9';
	}
	return v;
}
string mem(string v){
	for(int i=0;i<v.size();i++){
		if(v[i] >= '0' && v[i] <= '8') v[i] += 1;
		else if(v[i] == '9') v[i] = '0';
	}
	return v;
}

int main(){
	int i, j, n;
	string s, o;
	
	cin >> n;
	for(i=0;i<n;i++){
		cin >> o >> s;
		for(j=o.size()-1;j>=0;j--){
			if(o[j] == 'J') s = mej(s);
			if(o[j] == 'C') s = mec(s);
			if(o[j] == 'E') s = mee(s);
			if(o[j] == 'A') s = mea(s);
			if(o[j] == 'P') s = mep(s);
			if(o[j] == 'M') s = mem(s);
		}
		cout << s << endl;
	}
	
	
	return 0;
}

C++: #include <bits/stdc++.h>
using namespace std;
typedef long long ll;
#define all(x) (x).begin(),(x).end()
const int mod=1000000007,MAX=1300005,INF=1<<29;

int main(){
    
    std::ifstream in("text.txt");
    std::cin.rdbuf(in.rdbuf());
    cin.tie(0);
    ios::sync_with_stdio(false);
    
    int N;cin>>N;
    while(N--){
        string S,T;cin>>S>>T;
        reverse(all(S));
        
        for(auto c:S){
            if(c=='J'){
                string sub=T;
                for(int i=0;i<T.size();i++){
                    sub[(i+1)%T.size()]=T[i];
                }
                T=sub;
            }else if(c=='C'){
                string sub=T;
                for(int i=0;i<T.size();i++){
                    sub[(T.size()+i-1)%T.size()]=T[i];
                }
                T=sub;
            }else if(c=='E'){
                string left=T.substr(0,T.size()/2),right=T.substr(T.size()-T.size()/2,T.size()/2),mid=T.substr(T.size()/2,T.size()%2);
                T=right+mid+left;
            }else if(c=='A'){
                reverse(all(T));
            }else if(c=='P'){
                for(int i=0;i<T.size();i++){
                    if('0'<=T[i]&&T[i]<='9'){
                        if(T[i]!='0') T[i]--;
                        else T[i]+=9;
                    }
                }
            }else if(c=='M'){
                for(int i=0;i<T.size();i++){
                    if('0'<=T[i]&&T[i]<='9'){
                        if(T[i]!='9') T[i]++;
                        else T[i]-=9;
                    }
                }
            }
        }
        
        cout<<T<<endl;
    }
}

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

using namespace std;

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

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

string swap_half (string s) {
    bool even = s.size() % 2 == 0;
    int h = s.size() /2;
    if (even) {
        return s.substr(h, h) + s.substr(0, h);
    } else {
        return s.substr(h + 1, h) + s.substr(h, 1) + s.substr(0, h);
    }
}

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

string inc_dig (string s) {
    string ret = "";
    for (char c : s) {
        if(isdigit(c)) {
            ret += ((c - '0') + 1) % 10 + '0';
        } else {
            ret += c;
        }
    }
    return ret;
}

string dec_dig (string s) {
    string ret = "";
    for (char c : s) {
        if(isdigit(c)) {
            ret += ((c - '0') + 9) % 10 + '0';
        } else {
            ret += c;
        }
    }
    return ret;
}

int main() {
    int n;
    cin >> n;
    while (n--) {
        string opers, s;
        cin >> opers >> s;
        for (auto op = opers.rbegin(); op != opers.rend(); ++op) {
            if(*op == 'J') {
                s = rotate_right(s);
            } else if (*op == 'C') {
                s = rotate_left(s);
            } else if (*op == 'E') {
                s = swap_half(s);
            } else if (*op == 'A') {
                s = rev(s);
            } else if (*op == 'P') {
                s = dec_dig(s);
            } else if (*op == 'M') {
                s = inc_dig(s);
            }
        }
        cout << s << endl;
        
    }
    return 0;
}