//#pragma GCC optimize("Ofast,O3,unroll-loops")
//#pragma GCC target("avx2,bmi,bmi2,lzcnt,popcnt")
#include<bits/stdc++.h>
#define int long long
#define F first
#define S second
#define pb push_back
#define popp pop_back
#define in insert
#define endl "\n"
//#define mid (l+r)/2
using namespace std;
int32_t main(){
ios_base::sync_with_stdio(false);cin.tie(nullptr);cout.tie(nullptr);
int n,m,k,x;
cin>>n>>m>>k>>x;
int b[m+1];
char V[m+1];
string pos[m+1];
int tt=0;
string s;cin>>s;
for(int i=0;i<n;i++){
if(s[i]=='#'){
b[++tt]=i;
}
}
for(int i=1;i<=m;i++){
cin>>pos[i];
sort(pos[i].begin(),pos[i].end());
}
for(int i=1;i<=m;i++){
for(int j=0;j<k;j++){
int can=1;
for(int z=i+1;z<=m;z++){
if(can>=x) break ;
else can*=k;
}
if(can>=x){
s[b[i]]=pos[i][j];
break ;
}
else x-=can;
}
}
cout<<s;
return 0;
}
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