#pragma GCC optimize ("O2")
#pragma GCC target ("avx2")
//#include<bits/stdc++.h>
//#include<atcoder/all>
//using namespace atcoder;
#include<iostream>
#include<cstring>

using namespace std;
typedef long long ll;
#define rep(i, n) for(int i = 0; i < (n); i++)
#define rep1(i, n) for(int i = 1; i <= (n); i++)
#define co(x) cout << (x) << "\n"
#define cosp(x) cout << (x) << " "
#define ce(x) cerr << (x) << "\n"
#define cesp(x) cerr << (x) << " "
#define pb push_back
#define mp make_pair
#define chmin(x, y) x = min(x, y)
#define chmax(x, y) x = max(x, y)
#define Would
#define you
#define please


int A[200200];
const int mod = 998244353;
constexpr ll modpow(ll A, ll B) {
	ll kotae = 1;
	while (B > 0) {
		if (B & 1) kotae = kotae * A % mod;
		A = A * A % mod;
		B >>= 1;
	}
	return kotae;
}
const int CM = 1 << 17, CL = 12;
char cn[CM + CL], * ci = cn + CM + CL, * owa = cn + CM, ct;
const ll ma0 = 1157442765409226768;
const ll ma1 = 1085102592571150095;
const ll ma2 = 71777214294589695;
const ll ma3 = 281470681808895;
const ll ma4 = 4294967295;
inline int getint() {
	if (ci - owa > 0) {
		memcpy(cn, owa, CL);
		ci -= CM;
		fread(cn + CL, 1, CM, stdin);
	}
	ll tmp = *(ll*)ci;
	int dig = 68 - __builtin_ctzll((tmp & ma0) ^ ma0);
	tmp = tmp << dig & ma1;
	tmp = tmp * 10 + (tmp >> 8) & ma2;
	tmp = tmp * 100 + (tmp >> 16) & ma3;
	tmp = tmp * 10000 + (tmp >> 32) & ma4;
	ci += 72 - dig >> 3;
	return tmp;
}

int main() {
	cin.tie(0);
	ios::sync_with_stdio(false);

	
	int N = getint();
	rep1(i, N) A[i] = getint();

	int kotae = 0;
	rep1(i, N) {
		if (A[i] < 0) continue;
		int k = i;
		while (A[k] > 0) {
			int tmp = A[k];
			A[k] = -i;
			k = tmp;
		}
		kotae += (A[k] == -i);
	}

	co(modpow(2, kotae) - 1);

	Would you please return 0;
}
#include <bits/stdc++.h>
using namespace std;
struct Fast {Fast(){std::cin.tie(0);ios::sync_with_stdio(false);}} fast;
#define FOR(i, a, b) for(int i = (a); i < (b); i++)
#define RFOR(i, a, b) for(int i = (b) - 1; i >= (a); i--)
#define rep(i, n) for(int i = 0; i < (n); i++)
#define rep1(i, n) for(int i = 1; i < (n); i++)
#define rrep(i, n) for(int i = (n) - 1; i >= 0; i--)
#define ALL(i) (i).begin(),(i).end()
#define RALL(i) (i).begin(),(i).end(),greater<int>()
 
#define elif else if
#define eb emplace_back
#define pb push_back
#define mp make_pair
#define fst first
#define sec second
 
typedef long long ll;
#define TENNINE 1000000005
#define TENFIVE 100005
#define TENFIVE2 200005
// #define int long long
const int INF = 999999999;
const int MOD = 1e9 + 7;
const double EPS = 1e9 + 7;
const double PI = acos(-1);
const int dx[] = {0, 1, 0, -1}, dy[] = {1, 0, -1, 0};
 
inline int in(){int x;std::cin>>x;return x;}
 
using lint = long long;
using pint = pair<int, int>;
using vi = vector<int>;
using vii = vector<vector<int> >;
using vl = vector<long long>;
using vp = vector<pint>;
 
template <typename T> void print(T x) { std::cout << x << '\n'; }
template<typename A, size_t N, typename T>
void Fill(A (&array)[N], const T &val) {
  std::fill((T*)array, (T*)(array + N), val);
}
signed main(){
  string S;
  string T;
  cin>>S>>T;
  if (S =="Y"){
    // string newT ="";
   
    if(T=="a")T="A";
    if(T=="b")T="B";
    if(T=="c")T="C";
    
  }
  print(T);

  return 0;
}