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 <string>
#include <algorithm>

using namespace std;

int main(){

	int n;
	
	cin>>n;
	
	while(n--){
		
		string ord, mes;
		
		cin>>ord>>mes;
		reverse(ord.begin(), ord.end());
		int m=mes.size();
		
		for(int i=0; i<ord.size(); ++i){
			
			char c=ord[i];
			
			if(c=='J'){
				rotate(mes.begin(), mes.end()-1, mes.end());
			}
			else if(c=='C'){
				rotate(mes.begin(), mes.begin()+1, mes.end());
			}
			else if(c=='E'){
				
				if(m%2==1)
					mes = mes.substr(m/2+1) + mes[m/2] + mes.substr(0,m/2);
				else
					mes = mes.substr(m/2) + mes.substr(0,m/2);
			}
			else if(c=='A'){	
				reverse(mes.begin(), mes.end());
			}
			else if(c=='M'){
				
				for(int i=0; i<m; ++i){
					if('0'<=mes[i] && mes[i]<='9')
						mes[i] = mes[i]=='9'?'0':(mes[i]+1);
				}
			}
			else if(c=='P'){
				
				for(int i=0; i<m; ++i){
					if('0'<=mes[i] && mes[i]<='9')
						mes[i] = mes[i]=='0'?'9':(mes[i]-1);
				}
			}
		}
		
		cout << mes << endl;
	}
	
	return 0;
}

C++: #include <iostream>
#include <vector>
#include <algorithm>
#include <string>
#include <sstream>
#include <cstring>
#include <cstdio>
#include <cstdlib>
#include <cmath>
#include <queue>
#include <stack>
#include <map>
#include <set>
#include <numeric>
#include <cctype>

// BEGIN CUT HERE
#ifdef _MSC_VER
#include <agents.h>
#endif
// END CUT HERE 

#define FOR(i, a, b) for(int i = (a); i < (int)(b); ++i)
#define rep(i, n) FOR(i, 0, n)
#define ALL(v) begin(v), end(v)
#define REV(v) rbegin(v), rend(v)
#define MEMSET(v, s) memset(v, s, sizeof(v))
#define MP make_pair
#define MT make_tuple
#define X first
#define Y second

using namespace std;

typedef long long ll;
typedef unsigned long long ull;
typedef pair<ll, ll> P;

int main(){
	ios::sync_with_stdio(false);

	int n;
	cin >> n;
	while(n--){
		string ppl, mes;
		cin >> ppl >> mes;

		reverse(ALL(ppl));
		for (auto ch : ppl){
			string nxt;
			int m;
			switch (ch){
			case 'J':
				nxt = mes.back() + mes.substr(0, mes.size() - 1);
				break;
			case 'C':
				nxt = mes.substr(1) + mes[0];
				break;
			case 'E':
				m = mes.size() / 2;
				if (mes.size() & 1){
					nxt = mes.substr(m+1) + mes[m] + mes.substr(0, m);
				}
				else{
					nxt = mes.substr(m) + mes.substr(0, m);
				}
				break;
			case 'A':
				nxt = string(REV(mes));
				break;
			case 'M':
				for (auto c : mes){
					if ('0' <= c && c <= '8') ++c;
					else if (c == '9') c = '0';
					nxt += c;
				}
				break;
			case 'P':
				for (auto c : mes){
					if ('1' <= c && c <= '9') --c;
					else if (c == '0') c = '9';
					nxt += c;
				}
				break;
			}
			mes = nxt;
		}
		cout << mes << endl;
	}


	return 0;
}

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];
			c[i]=d[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(c[i]>='1'&&c[i]<='9'){
						c[i]=c[i]-1;
						check=true;
					}
					else if(c[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(c[i]>='0'&&c[i]<='8'){
						c[i]=c[i]+1;
						check=true;
					}
					else if(c[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;
}