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;
	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;
}

C++: #include <bits/stdc++.h>
#define MOD 1000000007
typedef long long ll;
using namespace std;

string ir,str;

string convert(string s,char alp){
  string res="";
  int n=s.size();
  if(alp=='J'){
    if(n==1) return s;
    res+=s.back();
    res+=s.substr(0,n-1);
  }else if(alp=='C'){
    if(n==1) return s;
    res+=s.substr(1,n-1);
    res+=s[0];
  }else if(alp=='E'){
    if(n==1) return s;
    else if(n%2){
      res+=s.substr(n/2+1,n/2);
      res+=s[n/2];
      res+=s.substr(0,n/2);
    }else{
      res+=s.substr(n/2,n/2);
      res+=s.substr(0,n/2);
    }
  }else if(alp=='A'){
    res=s;
    reverse(res.begin(),res.end());
  }else if(alp=='M'){
    res=s;
    for(int i=0;i<n;i++){
      if(res[i]>='0'&&res[i]<='9'){
        if(res[i]=='9') res[i]='0';
        else res[i]++;
      }
    }
  }else{
    res=s;
    for(int i=0;i<n;i++){
      if(res[i]>='0'&&res[i]<='9'){
        if(res[i]=='0') res[i]='9';
        else res[i]--;
      }
    }
  }
  return res;
}

void solve(){
  cin>>ir;
  cin>>str;

  for(int i=ir.size()-1;i>=0;i--){
    str=convert(str,ir[i]);
  }
  cout<<str<<endl;
}

int main(){
  int T;
  cin>>T;
  for(int i=0;i<T;i++) solve();

  return 0;
}

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

using namespace std;
 
string str;
 
void C(int len){
    char tmp = str[0];
    for(int i = 1 ; i < len; i++){
        str[i-1] = str[i];
    }
    str[len-1] = tmp;
}
 
void J(int len){
    char tmp = str[len-1];
    for(int i = len-2; i >=0 ; i--){
        str[i+1] = str[i];
    }
    str[0] = tmp;
}
 
void E(int len){
    int div = len/2;
     
    if(len%2==0){
        string f = str.substr(0,div) , g = str.substr(div,len-1);
        str = "";
        str += g+f;
    }
    else{
        string f = str.substr(0,div), g = str.substr(div+1,len);
        string mid = str.substr(div,1);
        str = "";
        str += g+mid+f;
    }
}
 
void A(){
    reverse(str.begin(),str.end());
}
 
void M(int len){
    for(int i = 0 ; i < len ; i++){
        if('0' <= str[i] && str[i] <= '8'){
            str[i] += 1;
        }
        else if(str[i] == '9') str[i] = '0';
    }
}
 
void P(int len){
    for(int i = 0 ; i < len ; i++){
        if('1' <= str[i] && str[i] <= '9'){
            str[i] -= 1;
        }
        else if(str[i] == '0') str[i] = '9';
    }
}
 
int main(){
    int n;
    cin >> n;
    while(n--){
        string order;
        cin >> order >> str;
         
        int len = str.size();
        reverse(order.begin(),order.end());
         
        for(int i = 0 ; i < (int)order.size() ; i++){
            switch(order[i]){
	    case 'J':
		J(len);
		break;
                     
	    case 'C':
		C(len);
		break;
                     
	    case 'E':
		E(len);
		break;
                     
	    case 'A':
		A();
		break;
                     
	    case 'M':
		M(len);
		break;
                     
	    case 'P':
		P(len);
		break;
            }
        }
        cout << str << endl;
    }
    return 0;
}