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;
	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 = 0;j < s.size();j++){
			if(s[j] == 'J'){
				c = de.front();
				de.pop_front();
				de.push_back(c);
			}
			else if(s[j] == 'C'){
				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'){
				c = de.front();
				de.pop_front();
				de.push_back(c);
				c = de.front();
				de.pop_front();
				de.push_back(c);
			}
			else if(s[j] == 'P'){
				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] == 'M'){
				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 <bits/stdc++.h>
using namespace std;

int main() {
  int n;
  cin >> n;

  while ( n-- ) {
    string ord, mes;
    cin >> ord >> mes;

    int l = (int)mes.size();    
    for ( int i = (int)ord.size()-1; i >= 0; i-- ) {      
      if ( ord[i] == 'J' ) {
	int c = mes[l-1];
	for ( int i = l-1; i > 0; i-- ) mes[i] = mes[i-1];
	mes[0] = c;	
      } else if ( ord[i] == 'C' ) {
	int c = mes[0];
	for ( int i = 0; i < l-1; i++ ) mes[i] = mes[i+1];
	mes[l-1] = c;	
      } else if ( ord[i] == 'E' ) {
	string a = "", b = "", c = "";	
	for ( int i = 0; i < l; i++ ) {
	  if ( l%2 && i == l/2 ) b += mes[i];
	  else if ( i < l/2 ) c += mes[i];
	  else a += mes[i];	  
	}
	mes = a+b+c;	
      } else if ( ord[i] == 'A' ) {
	reverse(mes.begin(), mes.end());	
      } else if ( ord[i] == 'P' ) {	
	for ( int i = 0; i < l; i++ ) {
	  if ( mes[i] == '0' ) mes[i] = '9';
	  else if ( isdigit(mes[i]) ) mes[i]--;	  
	}	  
      } else {
	for ( int i = 0; i < l; i++ ) {
	  if ( mes[i] == '9' ) mes[i] = '0';
	  else if ( isdigit(mes[i]) ) mes[i]++;	  
	}
      }      
    }

    cout << mes << endl;
  }
  
  return 0;
}

C++: #include <stdio.h>
#include <string.h>
#include <ctype.h>

int main(void){
	int n, i, j, k;
	char str[26], order[7], c, tmp;
	scanf("%d%*c",&n);
	for(i = 0;i < n;i++){
		j = 0;
		while((c = getchar()) != '\n')
			order[j++] = c;
		order[j] = '\0';
		j = 0;
		while((c = getchar()) != '\n')
			str[j++] = c;
		str[j] = '\0';
		for(j = strlen(order) - 1;j >= 0;j--){
			if(order[j] == 'J'){
				tmp = str[strlen(str) - 1];
				for(k = strlen(str) - 1;k > 0;k--)
					str[k] = str[k - 1];
				str[0] = tmp;
			}else if(order[j] == 'C'){
				tmp = str[0];
				for(k = 0;k < strlen(str) - 1;k++)
					str[k] = str[k + 1];
				str[strlen(str) - 1] = tmp;
			}else if(order[j] == 'E'){
				for(k = 0;k < strlen(str) / 2;k++){
					tmp = str[k];
					str[k] = str[k + (strlen(str) - 1) / 2 + 1];
					str[k + (strlen(str) - 1) / 2 + 1] = tmp;
				}
			}else if(order[j] == 'A'){
				for(k = 0;k < strlen(str) - 1 - k;k++){
					tmp = str[k];
					str[k] = str[strlen(str) - 1 - k];
					str[strlen(str) - 1 - k] = tmp;
				}
			}else if(order[j] == 'P'){
				for(k = 0;k < strlen(str);k++){
					if(isdigit(str[k])){
						if(str[k] == '0')
							str[k] = '9';
						else
							str[k]--;
					}
				}
			}else if(order[j] == 'M'){
				for(k = 0;k < strlen(str);k++){
					if(isdigit(str[k])){
						if(str[k] == '9')
							str[k] = '0';
						else
							str[k]++;
					}
				}
			}
		}
		printf("%s\n",str);
	}
	return 0;
}

C++: null