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 <deque>
#include <string>
using namespace std;

int main(){
	int n;
	string s,t;
	char c,d;
	deque<char> de,sub;
	cin >> n;
	for(int i = 0;i < n;i++){
		cin >> s >> t;
		de.clear();
		for(int j = 0;j < t.size();j++){
			de.push_back(t[j]);
		}
		for(int j = s.size()-1;j >= 0;j--){
			//cout << s[j] <<endl;
			if(s[j] == 'C'){
				c = de.front();
				de.pop_front();
				de.push_back(c);
			}
			else if(s[j] == 'J'){
				c = de.back();
				de.pop_back();
				de.push_front(c);
			}
			else if(s[j] == 'A'){
				for(int k = 0;k < de.size()/2;k++){
					swap(de[k],de[de.size()-k-1]);
				}
			}
			else if(s[j] == 'E'){
				if(de.size()%2 == 1){
					for(int k = 0;k < t.size()/2;k++){
						c = de.back();
						de.pop_back();
						sub.push_front(c);
					}
					c = de.back();
					de.pop_back();
					de.push_front(c);
					//cout << c << endl;
					while(!sub.empty()){
						c = sub.back();
						sub.pop_back();
						de.push_front(c);
					}
				}
				else{
					for(int k = 0;k < de.size()/2;k++){
						c = de.front();
						de.pop_front();
						de.push_back(c);
					}
				}
			}
			else if(s[j] == 'M'){
				for(int k = 0;k < de.size();k++){
					if(de[k] >= '0' && de[k] <='8'){
						de[k]++;
					}
					else if(de[k] == '9'){
						de[k] = '0';
					}
				}
			}
			else if(s[j] == 'P'){
				for(int k = 0;k < de.size();k++){
					if(de[k] >= '1' && de[k] <='9'){
						de[k]--;
					}
					else if(de[k] == '0'){
						de[k] = '9';
					}
				}
			}
		}
		for(int j = 0;j < de.size();j++){
			cout << de[j];
			if(j == de.size()-1)cout <<endl;
		}
	}

	return 0;
}

C++: #include <iostream>
#include <string>
#include <algorithm>
using namespace std;
int main(){

  int n;
  cin>>n;
  for(int cnt=0;cnt<n;cnt++){
    string com,s;
    cin>>com>>s;
  reverse(com.begin(),com.end());
  for(int i=0;i<com.size();i++){
    string s0;
    if(com[i]=='C'){
      for(int j=1;j<s.size();j++) s0.push_back(s[j]);
      s0+=s[0];
    }
    else  if(com[i]=='J'){
      s0+=s[s.size()-1];
      for(int j=0;j<s.size()-1;j++) s0.push_back(s[j]);
    }
    else  if(com[i]=='E'){
      int sLen=s.size();
      //cout<<sLen<<endl;
      if(sLen%2) sLen++;
      sLen/=2;
      for(int j=sLen;j<s.size();j++) s0.push_back(s[j]);
      if(s.size()%2) s0.push_back(s[s.size()/2]);
      for(int j=0;j<s.size()/2;j++) s0.push_back(s[j]);
    }
    else  if(com[i]=='A'){
     reverse(s.begin(),s.end());
     s0=s;
    }
    else  if(com[i]=='M'){
      for(int j=0;j<s.size();j++){
	if('0'<=s[j]&&s[j]<='8') s[j]++;
	else if(s[j]=='9') s[j]='0';
      }
      s0=s;
    }
    else  if(com[i]=='P'){
      for(int j=0;j<s.size();j++){
	if('1'<=s[j]&&s[j]<='9') s[j]--;
	else if(s[j]=='0') s[j]='9';
      }
      s0=s;
    }
    s=s0;
    //    cout<<com[i]<<" "<<s<<endl;
  }
  cout<<s<<endl;
  }
  return 0;
  
}

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

using namespace std;

int main() {
	int n;
	string a, b;
	string p1 = "98765432109";
	string p2 = "01234567890";
	cin >> n;
	getline(cin, a);
	for (int i = 0; i < n; i++) {
		getline(cin, a);
		getline(cin, b);
		for (int j = a.size()-1; j >= 0; j--) {
			if (a[j] == 'J') {
				string c = "";
				c += b[b.size()-1];
				b = b.substr(0, b.size()-1);
				c += b;
				b = c;
			} else if (a[j] == 'C') {
				string c = "";
				c = b.substr(1);
				c += b[0];
				b = c;
			} else if (a[j] == 'E') {
				string c1 = b.substr(0, b.size()/2);
				if (b.size() % 2 == 0) {
					string c2 = b.substr(b.size()/2);
					b = c2+c1;
				} else {
					string c2 = b.substr(b.size()/2+1);
					string c3 = "";
					c3 += b[b.size()/2];
					b = c2+c3+c1;
				}
			} else if (a[j] == 'A') {
				string c = "";
				for (int k = b.size()-1; k >= 0; k--) {
					c += b[k];
				}
				b = c;
			} else if (a[j] == 'P') {
				for (int k = 0; k < b.size(); k++) {
					if (0 <= b[k]-'0' && b[k]-'0' <= 9) {
						for (int l = 0; l < p1.size()-1; l++) {
							if (b[k] == p1[l]) {
								b[k] = p1[l+1];
								break;
							}
						}
					}
				}
			} else {
				for (int k = 0; k < b.size(); k++) {
					if (0 <= b[k]-'0' && b[k]-'0' <= 9) {
						for (int l = 0; l < p2.size()-1; l++) {
							if (b[k] == p2[l]) {
								b[k] = p2[l+1];
								break;
							}
						}
					}
				}
			}
		}
		cout << b << endl;
	}
	return 0;
}