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<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;
	stock.clear();
	int l=st.size()/2;
	for(int k=0;k<l;k++){
	  stock+=st[k];
	}
	string stock2;
	stock2.clear();
	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{
	  st=stock2+stock;
	}
      }
      else if(x[j]=='A'){
	string stock;
	stock.clear();
	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;
}

C++: #include <bits/stdc++.h>

#define REP(i, n) for(int i = 0; i < (int) (n); i++)
#define ALL(v) (v).begin(), (v).end()
#define INF 1e9

using namespace std;

char alphabet[52];

int main(){
  int n;
  cin >> n;
  REP(counter, n) {
    string messenger; cin >> messenger;
    string message; cin >> message;
    string recon = message;
    REP(i, messenger.size()){
      char target = messenger[messenger.size()-1-i];
      if(target == 'J'){
        REP(j, message.size()) recon[j] = message[(j-1+message.size()) % message.size()];
      }else if(target == 'C'){
        REP(j, message.size()) recon[j] = message[(j+1) % message.size()];
      }else if(target == 'E'){
        REP(j, message.size()/2) swap(recon[j], recon[j+message.size()/2+message.size()%2]);
      }else if(target == 'A'){
        reverse(ALL(recon));
      }else if(target == 'P'){
        REP(j, message.size()){
          if('0' <= message[j] and message[j] <= '9'){
            int digit = message[j] - '0';
            digit = (digit - 1 + 10) % 10;
            recon[j] = digit + '0';
          }
        }
      }else if(target == 'M'){
        REP(j, message.size()){
          if('0' <= message[j] and message[j] <= '9'){
            int digit = message[j] - '0';
            digit = (digit + 1) % 10;
            recon[j] = digit + '0';
          }
        }
      }
      message = recon;
    }
    cout << message << endl;
  }
  return 0;
}

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

using namespace std;

int main(){
	int n;	cin>>n;
	while(n--){
		string s,m;	cin>>s>>m;
		int len=m.length();
		for(int i=s.length()-1;i>=0;i--){
			if     (s[i]=='J')	rotate(m.begin(),m.begin()+len-1,m.end());
			else if(s[i]=='C')	rotate(m.begin(),m.begin()+1,m.end());
			else if(s[i]=='E'){
				if(len%2==0)	m=m.substr(len/2)+m.substr(0,len/2);
				else			m=m.substr(len/2+1)+m[len/2]+m.substr(0,len/2);
			}
			else if(s[i]=='A')	reverse(m.begin(),m.end());
			else if(s[i]=='P'){
				for(int j=0;j<len;j++){
					if(isdigit(m[j]))	m[j]=(m[j]-'0'+9)%10+'0';
				}
			}
			else if(s[i]=='M'){
				for(int j=0;j<len;j++){
					if(isdigit(m[j]))	m[j]=(m[j]-'0'+1)%10+'0';
				}
			}
		}
		cout<<m<<endl;
	}

	return 0;
}