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 <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <ctype.h>
#include <ctype.h>
void getline_2(char s[], int lim);


int main(){


// 各種変数宣言                                                                                  


// データ、バッファ、解の配列宣言 ;                                                              

// メインループ                                                                                  
    char line,c[100],k,f;
    int i,l,j,countm=0,m,n,a,num,x,y;

    //printf( "nは？：" );                                                                       
    scanf( " %d", &n);
    (void)getchar();

    for(x=0;x<n;x++){
        char order[100]={};
        char message[100]={};
        char buff[100]={};
        //printf( "1~6文字の文字列を入力してください：" );                                       
        getline_2(order, 10);

        y=strlen(order);

        //printf( "1~25文字の文字列を入力してください：" );                                      
        getline_2(message, 30);



        for(l=y-1;l>=0;l--){
            switch (order[l]) {
                case 'J' :
                    m=strlen(message);
                    k=message[m-1];
                    for(j=m-1;j>0;j--){
                        message[j]=message[j-1];
                    }
                    message[0]=k;
                    break;

                case 'C' :


                    k=message[0];
                    m=strlen(message);
                    for(j=1;j<m;j++){
                        message[j-1]=message[j];
                    }
                    message[m-1]=k;
                    break;

                case 'E' :
                    m=strlen(message);
                    if(m%2){
                        f=m/2+1;
                        for(j=0;j<f-1;j++){
                            buff[j+f]=message[j];
                        }
                        for(j=f;j<m;j++){
                            message[j-f]=message[j];}
                        for(j=f;j<m;j++){
                            message[j]=buff[j];}
                    }
                    else{
                        f=m/2;
                        for(j=0;j<f;j++){
                            buff[j+f]=message[j];
                        }
                        for(j=f;j<m;j++){
                            message[j-f]=message[j];}
                        for(j=f;j<m;j++){
                            message[j]=buff[j];}

                    }break;
                case 'A' :
                    m=strlen(message);
                    for (j = 0; j < m/2; j++) {
                        k = message[j];
                        message[j] = message[m-1-j];
                        message[m-1-j] = k;
                    }
                    break;

                case 'P':

                    m=strlen(message);
                    for (j=0;j<m;j++){
                        if( isalpha(message[j]) == 0 ){
                            if(message[j]=='0'){
                                message[j]='9';
                            }else
                                message[j]=message[j]-1;
                        }}
                    break;
                case 'M':


                    m=strlen(message);
                    for (j=0;j<m;j++){
                        if( isalpha(message[j]) == 0 ){
                            if(message[j]=='9'){
                                message[j]='0';
                            }else
                                message[j]=message[j]+1;
                        }}
                    break;

                default:
                    break;
            }
            //for(i=0;i<26;i++)printf("%c",message[i]);                                          
            //printf("\n");                                                                      
        }
        //        for(i=0;i<26;i++)printf("%c",message[i]);                                      
        //printf("\n");                                                                          
        printf("%s\n", message);
    }
    return 0 ;
}

void getline_2(char s[], int lim){
    int c, i;       //getcharからの受け取り用変数c、ループ用変数i                                
    for (i = 0; i < lim - 1 && (c = getchar()) != '\n'; ++i){
        s[i] = c;
        //格納の確認                                                                             
    }


}