#include<string>
#include<iostream>
#include<cstdio>
#include<vector>
#include<algorithm>
#include<functional>
using namespace std;
typedef long long int llint;
#define pub push_back
#define mp make_pair
#define fir first
#define sec second
const int big=((llint)1<<30);
const llint mod=91254389315231;//そすー
const int lol=101;
//aabbaabb

//
int main(void){
	llint x,y,n,i,gen,bmax,bmin,q,j,m,d,k,qx,qy,ans=0;
	vector<string> a;
	vector<vector<llint>> rolh;
	cin>>n;
	a.resize(n);
	rolh.resize(n);
	for(i=0;i<n;i++){
		cin>>a[i];
		rolh[i].resize(a[i].size());gen=0;
		for(j=0;j<a[i].size();j++){
			gen*=lol;
			gen+=a[i][j];
			gen%=mod;
			rolh[i][j]=gen;
		}
	}
	cin>>m>>x>>d;
	for(k=1;k<=m;k++){
		qx=(x/(n-1));
		qy=(x%(n-1));
		if(qx>qy){swap(qx,qy);} else{qy++;}
		x=(x+d)%(n*(n-1));bmax=min(rolh[qx].size(),rolh[qy].size());bmin=-1;
		while(bmax-bmin>1){
			gen=(bmax+bmin)/2;
			if(rolh[qx][gen]!=rolh[qy][gen]){ bmax=gen; } else{ bmin=gen; }
		}
		ans+=bmax;
	}
	cout<<ans<<endl;
	return 0;
}