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 <vector>
#include <string>
#include <algorithm>
#include <utility>
#include <numeric>
#include <array>
#include <cmath>
#include <map>
#include <memory>
using namespace std;
//変数デバッグ
#define DEB(variable) cout << #variable << '=' << variable << endl

//for簡易表記(引数ミス防止)
#define FOR(LoopVariable,numberOFbegin,numberOFend) for (long long int LoopVariable = (numberOFbegin); (LoopVariable) < (numberOFend); (LoopVariable)++)
#define DEFOR(LoopVariable,numberOFbegin,numberOFend) for (long long int LoopVariable = (numberOFbegin)-1; (LoopVariable) >= (numberOFend); (LoopVariable)--)
#define REP(LoopVariable,numberOFend) for(long long int LoopVariable = 0;(LoopVariable)<(numberOFend);LoopVariable++)

constexpr long long int linf = numeric_limits<long long int>::max()-5;
constexpr int inf= numeric_limits<int>::max()-5;
constexpr long long int mod = 1000000007;

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

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

string E_swap(string s){
    REP(i,(long long int)s.size()/2){
        swap(s[i], s[i + (1 + s.size()) / 2]);
    }
    return s;
}

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

string P_increment(string s){
      REP(i,(long long int)s.size()){
        if('1'<=s[i]&&s[i]<='9'){
            s[i]--;
        }else if(s[i]=='0'){
            s[i] = '9';
        }
    }
    return s;
}


string M_decrement(string s){
    REP(i,(long long int)s.size()){
        if('0'<=s[i]&&s[i]<='8'){
            s[i]++;
        }else if(s[i]=='9'){
            s[i] = '0';
        }
    }
  
    return s;
}


int main(){

    long long int n;
    cin >> n;
    string a,b;
    REP(i,n){
        cin >> a >> b;
        DEFOR(j,(long long int)a.size(),0){
            if(a[j]=='C'){
                b = C_rotate(b);
            }else if(a[j]=='J'){
                b = J_rotate(b);
            }else if(a[j]=='E'){
                b = E_swap(b);
            }else if(a[j]=='A'){
                b = A_reverse(b);
            }else if(a[j]=='P'){
                b = P_increment(b);
            }else if(a[j]=='M'){
                b = M_decrement(b);
            }
        }
        cout << b << endl;
    }

    return 0;
}

C++: #include <bits/stdc++.h>
using namespace std;
int main(){
	int n;
	cin>>n;
	while(n--){
		string s,ss;
		cin>>s>>ss;
		for(int i=s.size()-1;i>=0;i--){
			if(s[i]=='P')
				for(int j=0;j<ss.size();j++)
					if(ss[j]>='0'&&ss[j]<='9')
						ss[j]=(ss[j]-'0'+9)%10+'0';
			if(s[i]=='M')
				for(int j=0;j<ss.size();j++)
					if(ss[j]>='0'&&ss[j]<='9')
						ss[j]=(ss[j]-'0'+1)%10+'0';
			if(s[i]=='A')reverse(ss.begin(),ss.end());
			if(s[i]=='E')for(int k=0;k<ss.size()/2;k++)swap(ss[k],ss[(ss.size()+1)/2+k]);
			if(s[i]=='J')ss=ss[ss.size()-1]+ss.substr(0,s.size()-1);
			if(s[i]=='C')ss=ss.substr(1,ss.size()-1)+s[0];
		}
		cout<<ss<<endl;
	}
}

C++: #include <bits/stdc++.h>
using namespace std;
int main(){
	int n;
	cin>>n;
	while(n--){
		string s,ss;
		cin>>s>>ss;
		for(int i=s.size()-1;i>=0;i--){
			if(s[i]=='P')
				for(int j=0;j<ss.size();j++)
					if(ss[j]>='0'&&ss[j]<='9')
						ss[j]=(ss[j]-'0'+9)%10+'0';
			if(s[i]=='M')
				for(int j=0;j<ss.size();j++)
					if(ss[j]>='0'&&ss[j]<='9')
						ss[j]=(ss[j]-'0'+1)%10+'0';
			if(s[i]=='A')reverse(ss.begin(),ss.end());
			if(s[i]=='E')for(int k=0;k<ss.size()/2;k++)swap(ss[k],ss[(ss.size()+1)/2+k]);
			if(s[i]=='J')ss=ss[ss.size()-1]+ss.substr(0,ss.size()-1);
			if(s[i]=='C')ss=ss.substr(1,ss.size()-1)+s[0];
		}
		cout<<ss<<endl;
	}
}

C++: #include<iostream>
#include<string>
using namespace std;
int main(){
	int n;
	string a,b;
	char c[100],d[100];
	cin>>n;
	for(int u=0;u<n;u++){
		cin>>a>>b;
		for(int i=0;i<b.size();i++)
			d[i]=b[i];
		for(int i=a.size()-1;i>=0;i--){
			if(a[i]=='J'){
				for(int i=0;i<b.size()-1;i++)
					c[i+1]=d[i];
				c[0]=d[b.size()-1];
			}
			if(a[i]=='C'){
				for(int i=0;i<b.size()-1;i++)
					c[i]=d[i+1];
				c[b.size()-1]=d[0];
			}
			if(a[i]=='E'){
				for(int i=0;i<b.size();i++){
					if(i<b.size()/2)
						c[i+b.size()-b.size()/2]=d[i];
					else
						c[i-b.size()+b.size()/2]=d[i];
				}
			}
			if(a[i]=='A'){
				for(int i=0;i<b.size();i++)
					c[i]=d[b.size()-1-i];
			}
			if(a[i]=='P'){
				for(int i=0;i<b.size();i++){
					bool check=false;
					if(d[i]>='1'&&d[i]<='9'){
						c[i]=d[i]-1;
						check=true;
					}
					if(d[i]=='0'){
						c[i]='9';
						check=true;
					}
					if(check==false)
						c[i]=d[i];
				}
			}
			if(a[i]=='M'){
				for(int i=0;i<b.size();i++){
					bool check=false;
					if(d[i]>='0'&&b[i]<='8'){
						c[i]=d[i]+1;
						check=true;
					}
					if(d[i]=='9'){
						c[i]='0';
						check=true;
					}
					if(check==false)
						c[i]=d[i];
				}
			}
			for(int i=0;i<b.size();i++)
				d[i]=c[i];
		}
		for(int i=0;i<b.size();i++)
			cout<<d[i];
		cout<<endl;
	}
	return 0;
}