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>
using namespace std;
int main(){
	int n;
	cin>>n;
	while(n--){
		string s,ss;
		cin>>s>>ss;
		for(int i=s.size()-1;i>=0;i--){
			if(s[i]=='P')
				for(int j=0;j<ss.size();j++)
					if(ss[j]>='0'&&ss[j]<='9')
						ss[j]=(ss[j]-'0'+9)%10+'0';
			if(s[i]=='M')
				for(int j=0;j<ss.size();j++)
					if(ss[j]>='0'&&ss[j]<='9')
						ss[j]=(ss[j]-'0'+1)%10+'0';
			if(s[i]=='A')reverse(ss.begin(),ss.end());
			if(s[i]=='E')for(int k=0;k<ss.size()/2;k++)swap(ss[k],ss[(ss.size()+1)/2+k]);
			if(s[i]=='J')ss=ss[ss.size()-1]+ss.substr(0,s.size()-2);
			if(s[i]=='C')ss=ss.substr(1,s.size()-1)+s[0];
		}
		cout<<ss<<endl;
	}
}

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

int main(){
  int n;
  cin>>n;
  for(int i=0;i<n;i++){
    char a[7],ans[26],b[26],x=0,y=0;
    scanf("%s",a);
    x=strlen(a);
    scanf("%s",ans);
    y=strlen(ans);  

    for(int j=0;j<y;j++)
      b[j]=ans[j];

    for(int k=x-1;k>=0;k--){
      if(a[k]=='C'){//??????
	b[y-1]=ans[0];
	for(int j=1;j<y;j++) b[j-1]=ans[j];
      }
      else if(a[k]=='J'){//??????
	b[0]=ans[y-1];
	for(int j=0;j<y-1;j++) b[j+1]=ans[j];
      }
      else if(a[k]=='E'){//swap
	if(y%2==0)
	  for(int j=0;j<y/2;j++) 
	    swap(b[j],b[j+(y/2)]);
	else
	  for(int j=0;j<y/2;j++) 
	    swap(b[j],b[j+(y/2)+1]);



      }
      else if(a[k]=='A'){//????????????
	int o=y;
	while(1){
	  if(o==0)break;
	  for(int j=0;j<y;j++){
	    b[j]=ans[o-1];
	    o--;
	  }
	}
      }
      else if(a[k]=='M'){//+1
	for(int j=0;j<y;j++) 
	  if(ans[j]>='0'&&ans[j]<='8') b[j]=ans[j]+1;
	  else if(ans[j]=='9') b[j]=ans[j]-9;
      }
      else if(a[k]=='P')//-1
	for(int j=0;j<y;j++) 
	  if(ans[j]>='1'&&ans[j]<='9') b[j]=ans[j]-1;
	  else if(ans[j]=='0') b[j]=ans[j]+9;

      for(int j=0;j<y;j++)
	ans[j]=b[j];
    }h
    for(int j=0;j<y;j++)
      cout<<ans[j];
    cout<<endl;

  }
  return 0;
}

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

string dec(string str,char c){
	if(c=='J'){
		int e=str.size()-1;
		str=str[e]+str;
		str.pop_back();
	}
	else if(c=='C'){
		str=str+str[0];
		str.erase(str.begin());
	}
	else if(c=='E'){
		int t=0;
		while(2*t<(str.size()-1)){
			swap(str[t],str[(str.size()+1)/2+t]);
			t++;
		}
	}
	else if(c=='A'){
		reverse(str.begin(),str.end());
	}
	else if(c=='P'){	
		for(int i=0;i<str.size();i++){
			if(str[i]>='0' && str[i]<='9')str[i]=((str[i]-'0')+9)%10+'0';
		}
	}
	else if(c=='M'){
		for(int i=0;i<str.size();i++){
			if(str[i]>='0' && str[i]<='9')str[i]=((str[i]-'0')+1)%10+'0';
		}
	}
	return str;
}

int main(){
	int n;
	cin>>n;
	while(n--){
		string ord,mes;
		cin>>ord>>mes;
		reverse(ord.begin(),ord.end());
		for(int i=0;i<ord.size();i++){
			mes=dec(mes,ord[i]);
		}
		cout<<mes<<endl;
	}
}

C++: #include<bits/stdc++.h>
using namespace std;
#define FOR for(int k = 0; k < si2; k++)
#define M(a) ('0'<=a&&a<='9')?(a-'0'+1)%10+'0':a
#define P(a) ('0'<=a&&a<='9')?(a-'0'-1+10)%10+'0':a

int main(){
	int n, si, si2;
	string str, str2, temp;
	cin>>n;
	for(int i = 0; i < n; i++){
		cin>>str>>str2;
		si = str.size(); si2 = str2.size();
		for(int j = si-1; j >= 0; j--, str2 = temp){
			temp.clear();
			switch(str[j]){
				case 'C':FOR temp += str2[(k+1)%si2];			break;
				case 'J':FOR temp += str2[(k-1+si2)%si2];		break;
				case 'E':if(si2%2){str2+=str2[si2/2]; 
						 FOR temp += str2[(k+(si2+1)/2)%(si2+1)];}
						 else FOR temp += str2[(k+si2/2)%si2];	break;
				case 'A':FOR temp += str2[si2-k-1];break;
				case 'M':FOR temp += M(str2[k]);				break;
				case 'P':FOR temp += P(str2[k]);				break;
			}
		}
		cout<<str2<<endl;
	}
	return 0;
}