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#include <bits/stdc++.h>
using namespace std;
#define endl "\n"
#define ll long long

void solve(){
	ll n,cnt,cnt2;
	cin >> n;
	cnt=0;
	while(cnt + 9 <= n){
		cout << "9B";
		cnt+=9;
	}
	if(n-cnt == 1){
		cout << "B";
	}
	if(cnt != n && n-cnt != 1){
		cout << to_string(n-cnt) + "B";
	}
	cnt=0;
	while(cnt + 9 <= n){
		cout << "9D";
		cnt+= 9;
	}
	if(n-cnt == 1){
		cout << "D";
	}
	if(cnt != n && n-cnt != 1){
		cout << to_string(n-cnt) + "D";
	}
	cnt=0;
	for(int i = n; i > 0; i--){
		cout << "F";
		cnt2=0;
		while(cnt2+9 < i){
			cout << "9[BF]";
		}
		if(i-1-cnt2 == 1){
			cout << "BF";
		}
		if(i-1-cnt2 == 2){
			cout << "BFBF";
		}
		if(cnt2 != i-1 && i-1-cnt2 != 1 && i-1-cnt2 != 2){
			cout << to_string(i-1-cnt2) + "[BF]";
		}
		cnt2=0;
		while(cnt2+9 < i){
			cout << "9D";
		}
		if(i-1-cnt2 == 1){
			cout << "D";
		}
		if(cnt2 != i-1 && i-1-cnt2 != 1){
			cout << to_string(i-1-cnt2) + "D";
		}
	}
	cout << endl;
}

int main(){
	ios_base::sync_with_stdio(0);
	cin.tie(0);
	cout.tie(0);
	//freopen("input.txt", "r", stdin);
	solve();
	
}