#include<bits/stdc++.h>
#define int long long
using namespace std;
const int B = 11;
string op,t,s;
int n;
int a[10010];
int tot = 0;
int b[10010];
signed main(){
//	freopen("001.phase1.full.input","r",stdin);
	cin>>op;
	if(op[0] == 'A'){
		cin>>t>>n;
		for(int i = 1; i <= n; i++) cin>>a[i];
		int x = 1;
		int len = t.size();
		for(int i = 0; i < len - 1; i++) s += t[i],s += (char)('a' + 26);
		s += t[len - 1];
		len = s.size();
		for(int i = 0; i < len; i++){
			int it = s[i] - 'a';
			for(int j = 1; j <= B; j++){
				while(a[x] % 27 != it) x++;
				b[++tot] = a[x];
				x++;
			}
		}
		printf("%lld\n",tot);
		for(int i = 1; i <= tot; i++) printf("%lld ",b[i]);
	}
	else{
		cin>>n;
		for(int i = 1; i <= n; i++) cin>>a[i];
		int pre = -1;
		for(int i = 1; i <= n; i++){
			int tmp = a[i] % 27;
			if(tmp ^ pre){
				if(tmp <= 25) cout<<(char)(tmp + 'a');
				pre = tmp;
			}
		}
	}
	return 0;
}