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;
typedef long long ll;
typedef vector<int> VI;
typedef vector<VI> VVI;
typedef vector<ll> VL;
typedef vector<VL> VVL;
typedef pair<int, int> PII;

#define FOR(i, a, n) for (ll i = (ll)a; i < (ll)n; ++i)
#define REP(i, n) FOR(i, 0, n)
#define ALL(x) x.begin(), x.end()
#define MP make_pair
#define PB push_back
#define MOD 1000000007
#define INF (1LL<<30)
#define LLINF (1LL<<60)
#define PI 3.14159265359
#define EPS 1e-12
#define int ll

signed main(void)
{
  int n;
  cin >> n;
  REP(i, n) {
    string s, t;
    cin >> t >> s;
    for(int j=t.size()-1; j>=0; --j) {
      if(t[j] == 'C') {
        string tmp;
        FOR(i, 1, s.size()) tmp += s[i];
        tmp += s[0];
        s = tmp;
      } else if(t[j] == 'J') {
        string tmp;
        tmp += s[s.size()-1];
        REP(i, s.size()-1) tmp += s[i];
        s = tmp;
      } else if(t[j] == 'E') {
        string tmp;
        FOR(i, s.size()/2 + !!(s.size()%2), s.size()) tmp += s[i];
        if(s.size()%2) tmp += s[s.size()/2];
        REP(i, s.size()/2) tmp += s[i];
        s = tmp;
      } else if(t[j] == 'A') {
        REP(i, s.size()/2) swap(s[i], s[s.size()-1-i]);
      } else if(t[j] == 'M') {
        REP(i, s.size()) {
          if('0' <= s[i] && s[i] <= '8') s[i]++;
          else if(s[i] == '9') s[i] = '0';
        }
      } else if(t[j] == 'P') {
        REP(i, s.size()) {
          if('1' <= s[i] && s[i] <= '9') s[i]--;
          else if(s[i] == '0') s[i] = '9';
        }
      }
      //cout << j << " " << t[j] << " " << s << endl;
    }
    cout << s << endl;
  }

  return 0;
}

C++: #include <bits/stdc++.h>
using namespace std;

int main() {
  cin.tie(nullptr);
  ios::sync_with_stdio(false);
  int n;
  cin >> n;
  while (n--) {
    string ord, s;
    cin >> ord >> s;
    reverse(begin(ord), end(ord));
    for (char c : ord) {
      if (c == 'J') {
        rotate(begin(s), prev(end(s)), end(s));
      } else if (c == 'C') {
        rotate(begin(s), next(begin(s)), end(s));
      } else if (c == 'E') {
        if (s.size() & 1) {
          for (int i = 0; i < (int)s.size() / 2; ++i) {
            swap(s[i], s[(s.size() + 1) / 2 + i]);
          }
        } else {
          rotate(begin(s), begin(s) + s.size() / 2, end(s));
        }
      } else if (c == 'A') {
        reverse(begin(s), end(s));
      } else if (c == 'P') {
        for (auto&& e : s) {
          if (isdigit(e)) {
            e = e == '0' ? '9' : e - 1;
          }
        }
      } else {
        assert(c == 'M');
        for (auto&& e : s) {
          if (isdigit(e)) {
            e = e == '9' ? '0' : e + 1;
          }
        }
      }
    }
    cout << s << '\n';
  }
}

C++: #include "bits/stdc++.h"
using namespace std;

//#define int long long
#define DBG 0
#define dump(o) if(DBG){cerr<<#o<<" "<<o<<endl;}
#define dumpc(o) if(DBG){cerr<<#o; for(auto &e:(o))cerr<<" "<<e;cerr<<endl;}
#define rep(i,a,b) for(int i=(a);i<(b);i++)
#define rrep(i,a,b) for(int i=(b)-1;i>=(a);i--)
#define each(it,c) for(auto it=(c).begin();it!=(c).end();it++)
#define all(c) c.begin(),c.end()
const int INF = sizeof(int) == sizeof(long long) ? 0x3f3f3f3f3f3f3f3fLL : 0x3f3f3f3f;
const int MOD = (int)(1e9 + 7);

string A(string s) {
	reverse(all(s));
	return s;
}

string J(string s) {
	return s[s.size() - 1] + s.substr(0, s.size() - 1);
}

string M(string s) {
	rep(i, 0, s.size()) {
		if (isdigit(s[i])) {
			s[i] = char((s[i] - '0' + 1 + 10) % 10 + '0');
		}
	}
	return s;
}

string P(string s) {
	rep(i, 0, s.size()) {
		if (isdigit(s[i])) {
			s[i] = char((s[i] - '0' - 1 + 10) % 10 + '0');
		}
	}
	return s;
}

string E(string s) {
	int h = s.size() / 2;
	if (s.size() % 2)return s.substr(h + 1) + s[h] + s.substr(0, h);
	return s.substr(h) + s.substr(0, h);
}

string C(string s) {
	return s.substr(1, s.size()) + s[0];
}

signed main() {
	int n; cin >> n;
	rep(h, 0, n) {
		string o; cin >> o;
		string m; cin >> m;
		rrep(i, 0, o.size()) {
			if (o[i] == 'J')m = J(m);
			if (o[i] == 'C')m = C(m);
			if (o[i] == 'E')m = E(m);
			if (o[i] == 'A')m = A(m);
			if (o[i] == 'P')m = P(m);
			if (o[i] == 'M')m = M(m);
			dump(m);
		}
		cout << m << endl;
	}
	return 0;
}