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<bits/stdc++.h>
#define rep(i,n)for(int i=0;i<n;i++)
using namespace std;

int main() {
	int n; cin >> n;
	rep(i, n) {
		string m, s; cin >> m >> s;
		reverse(m.begin(), m.end());
		for (char c : m) {
			switch (c) {
			case'C':rotate(s.begin(), ++s.begin(), s.end()); break;
			case'J':rotate(s.begin(), --s.end(), s.end()); break;
			case'E':s = s.substr((int)s.size() / 2 + (int)s.size() % 2) + s.substr((int)s.size() / 2, (int)s.size() % 2) + s.substr(0, (int)s.size() / 2); break;
			case'A':reverse(s.begin(), s.end()); break;
			case'M':transform(s.begin(), s.end(), s.begin(), [](char c) {
				if (c == '9')return'0';
				if ('0' <= c&&c < '9')return ++c;
			}); break;
			case'P':transform(s.begin(), s.end(), s.begin(), [](char c) {
				if (c == '0')return'9';
				if ('0' < c&&c <= '9')return --c;
			}); break;
			}
		}
		cout << s << endl;
	}
}

C++: #include <iostream>
#include <string>
#include <stdio.h>
#include <cstdio>
#include <algorithm>
using namespace std;

int main(){
    int n;
    cin >> n;
    while( n-- ){
        string p, m;
        cin >> p >> m;
        reverse( p.begin(), p.end() );
        for( size_t i = 0; i < p.length(); i++ ){
            switch(p[i]){
                case 'J':{
                    char tmp = m[m.length() - 1];
                    for( size_t j = m.length() - 1; j > 0; j-- ){
                        //if( j == 0 ){
                        //}else{
                            m[j] = m[j-1];
                        //}
                        //cout << m[j] << endl;
                    }
                    m[0] = tmp;
                    break;
                }case 'C':{
                    char tmp = m[0];
                    for( size_t j = 0; j < m.length(); j++ ){
                        if( j == m.length() - 1 ) m[j] = tmp;
                        else m[j] = m[j+1];
                    }
                    break;
                }case 'E':{
                    string tmp = m.substr( 0, m.length() / 2 );
                    m.replace( 0, (m.length() - 1) / 2, m );
                    m.replace( m.length() / 2, tmp );
                    break;
                }case 'A':{
                    reverse( m.begin(), m.end() );
                    break;
                }case 'P':{
                    for( size_t j = 0; j < m.length(); j++ ){
                        if( '1' <= m[j] && m[j] <= '9' ){
                            m[j]--;
                        }else if( '0' == m[j] ){
                            m[j] = '9';
                        }
                    }
                    break;
                }case 'M':{
                    for( size_t j = 0; j < m.length(); j++ ){
                        if( '0' <= m[j] && m[j] <= '8' ){
                            m[j]++;
                        }else if( '9' == m[j] ){
                            m[j] = '0';
                        }
                    }
                    break;
                }
            }
        }
        cout << m << endl;
    }
}

C++: #include<iostream>
#include<vector>
#include<string>
#define rep(i,a,b) for(int i=a;i<b;i++)
using namespace std;
int main(void){
	int n;
	cin>>n;
	for(int k=0;k<n;k++){
		string s,o;
		cin>>o>>s;
		int t=o.size(),si=s.size();
		for(int i=t-1;i>=0;i--){
			if(o[i]=='J'){
				char temp=s[si-1];
				rep(j,1,si){
					s[si-j]=s[si-j-1];
				}
				s[0]=temp;
			}else if(o[i]=='C'){
				char temp=s[0];
				rep(j,0,si-1){
					s[j]=s[j+1];
				}
				s[si-1]=temp;
			}else if(o[i]=='A'){
				rep(j,0,si/2){
					swap(s[j],s[si-1-j]);
				}
			}else if(o[i]=='E'){
				string b,m,e;
				rep(j,0,si/2){
					b+=s[j];
				}
				int l=0;
				if(si%2==1){
					m=s[si/2];
					l++;
				}
				rep(j,si/2+l,si){
					e+=s[j];
				}
				s=e;
				s+=m;
				s+=b;

			}else if(o[i]=='P'){
				rep(j,0,si){
					if(s[j]>='0'&&s[j]<='9'){
						s[j]--;
						if(s[j]<'0'){
							s[j]='9';
						}
					}
				}
			}else{
					rep(j,0,si){
					if(s[j]>='0'&&s[j]<='9'){
						s[j]++;
						if(s[j]>'9'){
							s[j]='0';
						}
					}
				}
			}
		}
		cout<<s<<endl;

	}
	return 0;
}

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

int n;

int main(void){
	scanf("%d",&n);
	for(int i=0;i<n;i++){
		string a,b;
		cin >> a;
		cin >> b;
		for(int j=a.size();j>=0;j--){
			if(a[j]=='C'){
				string c=b.substr(1)+b[0];
				b=c;
			}
			if(a[j]=='J'){
				string c=b[b.size()-1]+b.substr(0,b.size()-1);
				b=c;
			}
			if(a[j]=='E'){
				for(int k=0;k<b.size()/2;k++){
					swap(b[k],b[k+(b.size()+1)/2]);
				}
			}
			if(a[j]=='M'){
				for(int k=0;k<b.size();k++){
					if(b[k]>='0' && b[k]<='9'){
						if(b[k]=='9')b[k]='0';
						else b[k]++;
					}
				}
			}
			if(a[j]=='P'){
				for(int k=0;k<b.size();k++){
					if(b[k]>='0' && b[k]<='9'){
						if(b[k]=='0')b[k]='9';
						else b[k]--;
					}
				}
			}
			if(a[j]=='A'){
				reverse(b.begin(),b.end());
			}
		}
		cout << b << endl;
	}
	return 0;
}