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 <algorithm>
#include <queue>
#include <utility>
#include <string>

#define REP(i,a,b) for(int i=int(a);i<int(b);i++)

using namespace std;

typedef long long int lli;
typedef pair<int,int> pii;

int main () {
    int n;
    cin >> n;
    while (n--) {
        string kings;
        cin >> kings;
        string message;
        cin >> message;
        for (int i = kings.size() - 1; i >= 0; i--) {
            if (kings[i] == 'J' && message.size() > 1) {
                message = message.substr(message.size() - 1, 1) + message.substr(0, message.size() - 1);
            }
            if (kings[i] == 'C' && message.size() > 1) {
                message = message.substr(1) + message.substr(0, 1);
            }
            if (kings[i] == 'E') {
                if (message.size() % 2) {
                    message = message.substr((message.size() + 1) / 2) + message[message.size() / 2] + message.substr(0, message.size() / 2);
                } else {
                    message = message.substr((message.size() + 1) / 2) + message.substr(0, message.size() / 2);
                }
            }
            if (kings[i] == 'A') {
                reverse(message.begin(), message.end());
            }
            if (kings[i] == 'P') {
                REP (j, 0, message.size()) {
                    if ('0' <= message[j] && message[j] <= '9') {
                        message[j]--;
                        if (message[j] < '0') message[j] = '9';
                    }
                }
            }
            if (kings[i] == 'M') {
                REP (j, 0, message.size()) {
                    if ('0' <= message[j] && message[j] <= '9') {
                        message[j]++;
                        if (message[j] > '9') message[j] = '0';
                    }
                }
            }
        }
        cout << message << endl;
    }

    return 0;
}

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

using namespace std;

int main(void)
{
	int i1,i2,i3;
	int n;
	string order;
	string s;
	char c;
	string temp1,temp2,temp3;


		cin >> n;

		for(i1=0;i1<n;i1++){
			cin >> order;
			cin >> s;

			reverse(order.begin(), order.end());

			for(i2=0;i2<order.size();i2++){
				if(order[i2]=='J'){
					c = s[s.size()-1];
					s = s.substr(0,s.size()-1);
					s = c + s;	
				}
				else if(order[i2]=='C'){
					c = s[0];
					s = s.substr(1);
					s = s + c;	
				}
				else if(order[i2]=='E'){
					temp2 = "";
					temp3 = s.substr(0,(s.size()/2));
					if(s.size()%2==1){
						temp2 = s.substr((s.size()/2),1);
						temp1 = s.substr((s.size()/2+1));
					}
					else temp1 = s.substr(s.size()/2);

					//cout << temp1 << " " << temp2 << " " << temp3 << endl;
					s = temp1 + temp2 + temp3;

				}
				else if(order[i2]=='A'){
					reverse(s.begin(), s.end());
				}
				else if(order[i2]=='P'){
					for(i3=0;i3<s.size();i3++){
						if(s[i3] >= '1' && s[i3] <= '9'){
							s[i3] = s[i3] - 1;
						}
						else if(s[i3]=='0'){
							s[i3] = '9';
						}
					}

				}
				else if(order[i2]=='M'){
					for(i3=0;i3<s.size();i3++){
						if(s[i3] >= '0' && s[i3] <= '8'){
							s[i3] = s[i3] + 1;
						}
						else if(s[i3]=='9'){
							s[i3] = '0';
						}
					}
				}

			}

			cout << s << endl;
		}

	return 0;

}

C++: #include<iostream>
#include<string>
#include<vector>
#include<cstdio>
using namespace std;
int main(){
  int n;
  string x;
  string st;
  cin >>n;
  for(int i=0;i<n;i++){
    cin >> x;
    cin >> st;
    for(int j=x.size()-1;j>=0;j--){
      if(x[j]=='C'){
	char stock;
	stock = st[0];
	st.erase(st.begin());
	st+=stock;
      }
      else if(x[j]=='J'){
	char stock;
	stock = st[st.size()-1];
	//	cout << "p1"<<endl;
	st.erase(st.size()-1);
	//cout <<"p2"<<endl;
	st.insert(st.begin(),stock);
      }
      else if(x[j]=='E'){
	string stock;
	int l=st.size()/2;
	for(int k=0;k<l;k++){
	  stock+=st[k];
	}
	string stock2;
	int od = st.size()%2;
	for(int k=l+od;k<l*2+od;k++){
	  stock2+=st[k];
	}
	char st3;
	if(od==1)st3+=st[l];
	st=stock2+st3+stock;
      }
      else if(x[j]=='A'){
	string stock;
	for(int k=0;st.empty()!=true;k++){
	  stock += st[0];
	  st.erase(st.begin());
	}
	//cout << stock <<endl;
	for(int k=stock.size()-1;k>=0;k--){
	  st+=stock[k];
	}
      }
      else if(x[j]=='M'){
	for(int k=0;k<st.size();k++){
	  if(st[k]>='0'&&st[k]<'9'){
	    st[k]++;
	  }
	  else if(st[k]=='9'){
	    st[k]='0';
	  }
	}
      }
      else if(x[j]=='P'){
	for(int k=0;k<st.size();k++){
	  if(st[k]>'0'&&st[k]<='9'){
	    st[k]--;
	  }
	  else if(st[k]=='0'){
	    st[k]='9';
	  }
	}
      }	

      //cout <<"it is "<<x[j]<<endl;
      //cout << st << endl;
    }
    cout << st << endl;
  }
  return 0;
}