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 <cstring>
#include <algorithm>
#include <sstream>

#define REP(i,k,n) for(int i=k;i<n;i++)
#define rep(i,n) for(int i=0;i<n;i++)

using namespace std;
typedef long long ll;

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

    rep(i,n) {
        string a,b;
        cin >> a >> b;

        rep(j,a.size()) {
            if(a[j] == 'J') {
                rotate(b.rbegin(),b.rbegin()+1,b.rend());
            }
            if(a[j] == 'C') {
                rotate(b.begin(),b.begin()+1,b.end());
            }
            if(a[j] == 'E') {
                stringstream ss;
                REP(k,b.size()/2,b.size()) {
                    ss << b[k];
                }

                rep(k,b.size()/2) {
                    ss << b[k];
                }

                b = ss.str();
            }
            if(a[j] == 'A') {
                reverse(b.begin(),b.end());
            }
            if(a[j] == 'P') {
                rep(k,b.size()) {
                    if(b[k] == '0') b[k] = '9';
                    if('1' <= b[k] && b[k] <= '9') b[k]--;
                }
            }
            if(a[j] == 'M') {
                rep(k,b.size()) {
                    if(b[k] == '9') b[k] = '0';
                    if('0' <= b[k] && b[k] <= '8') b[k]++;
                }
            }
        }

        cout << b << endl;

    }

    return 0;
}

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

int main(){
	int n;
	string s,t;
	char c,d;
	deque<char> de,sub;
	cin >> n;
	for(int i = 0;i < n;i++){
		cin >> s >> t;
		de.clear();
		for(int j = 0;j < t.size();j++){
			de.push_back(t[j]);
		}
		for(int j = s.size()-1;j >= 0;j--){
			//cout << s[j] <<endl;
			if(s[j] == 'C'){
				c = de.front();
				de.pop_front();
				de.push_back(c);
			}
			else if(s[j] == 'J'){
				c = de.back();
				de.pop_back();
				de.push_front(c);
			}
			else if(s[j] == 'A'){
				for(int k = 0;k <= de.size()/2;k++){
					swap(de[k],de[de.size()-k-1]);
				}
			}
			else if(s[j] == 'E'){
				if(de.size()%2 == 1){
					for(int k = 0;k < t.size()/2;k++){
						c = de.back();
						de.pop_back();
						sub.push_front(c);
					}
					c = de.back();
					de.pop_back();
					de.push_front(c);
					//cout << c << endl;
					while(!sub.empty()){
						c = sub.back();
						sub.pop_back();
						de.push_front(c);
					}
				}
				else{
					for(int k = 0;k < de.size()/2;k++){
						c = de.front();
						de.pop_front();
						de.push_back(c);
					}
				}
			}
			else if(s[j] == 'M'){
				for(int k = 0;k < de.size();k++){
					if(de[k] >= '0' && de[k] <='8'){
						de[k]++;
					}
					else if(de[k] == '9'){
						de[k] = '0';
					}
				}
			}
			else if(s[j] == 'P'){
				for(int k = 0;k < de.size();k++){
					if(de[k] >= '1' && de[k] <='9'){
						de[k]--;
					}
					else if(de[k] == '0'){
						de[k] = '9';
					}
				}
			}
		}
		for(int j = 0;j < de.size();j++){
			cout << de[j];
			if(j == de.size()-1)cout <<endl;
		}
	}

	return 0;
}

C++: #include<iostream>
#include<cstdio>
#include<cstring>
using namespace std;

int main(){
  int n;
  cin>>n;
  for(int i=0;i<n;i++){
    char a[7],ans[26],b[26],x=0,y=0;
    scanf("%s",a);
    x=strlen(a);
    scanf("%s",ans);
    y=strlen(ans);  

    for(int j=0;j<y;j++)
      b[j]=ans[j];

    for(int k=x-1;k>=0;k--){
      if(a[k]=='C'){//??????
	b[y-1]=ans[0];
	for(int j=1;j<y;j++) b[j-1]=ans[j];
      }
      else if(a[k]=='J'){//??????
	b[0]=ans[y-1];
	for(int j=0;j<y-1;j++) b[j+1]=ans[j];
      }
      else if(a[k]=='E'){//swap
	if(y%2==0)
	  for(int j=0;j<y/2;j++) 
	    swap(b[j],b[j+(y/2)]);
	else
	  for(int j=0;j<y/2;j++) 
	    swap(b[j],b[j+(y/2)+1]);



      }
      else if(a[k]=='A'){//????????????
	int o=y;
	while(1){
	  if(o==0)break;
	  for(int j=0;j<y;j++){
	    b[j]=ans[o-1];
	    o--;
	  }
	}
      }
      else if(a[k]=='M'){//+1
	for(int j=0;j<y;j++) 
	  if(ans[j]>='0'&&ans[j]<='8') b[j]=ans[j]+1;
	  else if(ans[j]=='9') b[j]=ans[j]-9;
      }
      else if(a[k]=='P')//-1
	for(int j=0;j<y;j++) 
	  if(ans[j]>='1'&&ans[j]<='9') b[j]=ans[j]-1;
	  else if(ans[j]=='0') b[j]=ans[j]+9;

      for(int j=0;j<y;j++)
	ans[j]=b[j];
    }
    for(int j=0;j<y;j++)
      cout<<ans[j];
    cout<<endl;

  }
  return 0;
}