记录

#include<iostream>
using namespace std;
const int N=1e5+3;
int n,m,na,nb;
char a[N],b[N];
int main() {
	ios::sync_with_stdio(0),cin.tie(0),cout.tie(0);
	cin>>n>>m;
	for(int i=0;i<n;++i) {
		cin>>a[i];
		if(a[i]=='#') ++na;
	}
	cin>>b;
	nb=m-na;
	int i=0;
	for(;i<n;++i) {
		if(nb<26) break;
		if(a[i]=='#') a[i]='a',nb-=25;
	}
	for(int j=0;j<26-nb&&i<n;++i) {
		if(a[i]=='#') a[i]='a'+j++;
	}
	for(int j=0;i<n;++i) {
		if(a[i]=='#') a[i]='a'+j++;
	}
	cout<<a;
	return 0;
}